The adult neurogenesis that takes place in the olfactory bulb is due to a migratory pathway from the subventricular zone.
Adult neurogenesis is basically defined as a process which involves the generation of functional neurons from the adult neural precursors and this occurs throughout life in the restricted brain regions in case of mammals. The new neurons are produced in two regions of brain.
The first is the subgranular zone (SGZ) which is a part of the dentate gyrus of the hippocampus and this is where the neural stem cells produce granule cells. The other is the subventricular zone or the SVZ of the lateral ventricles and it can be divided into three microdomains which are, lateral, dorsal and medial.
The neuroblasts present in the subventricular zone (SVZ) migrate along the rostral migratory stream or the RMS into the olfactory bulb, where they happen to differentiate into interneurons.
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NEED SOME HELP WITH THE ASSIGEMTN PLEASE
From the Competition Curve between the two species of bacteria above, we can answer the following questions:
15. The type of bacteria that will soon die is: P. caudatum, as the rate of their growth is decreasing constantly.
16. The bacteria strain better adapted for the competition is: P. aurelia.
17. The growth rate for P. caudatum is different when is grown alone because: it survives much longer as there is no longer competition.
18. The growth of P. aurelia at day 12 is: reaching the carrying capacity.
What is the competition curve?A competition curve depicts interactions between species in which both need a resource that has a limited supply. In the curve given, two types of bacteria, P. aurelia and P. caudatum are competing for limited space to grow. Meanwhile, two species can't coexist if they are competing for identical resources. Hence, one of the bacteria will have less population than the other. It is shown on the curve that P. caudatum has less population than P. aurelia due to limited space to grow.
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Macmillan Learning
Identify the parts of a eudicot seed on the diagram.
endosperm
epicotyl
hypocotyl
radicle
cotyledon
The leaves of eudicots feature netted venation and two cotyledons in the seeds.
Eudicot seeds: what are they?Seeds from eudicots, such as beans, sprout with two leaves. If you observe a seed sprout, you may easily determine whether a plant is a eudicot or monocot. A monocot has one seed leaf, and a eudicot has two seed leaves.The leaves of eudicots feature netted venation and two cotyledons in the seeds.Both monocot and eudicot embryos feature a plumule, an embryonic stem below the cotyledons called a hypocotyl, and a radicle that develops into the root. The plumule also houses the shoot apical meristem and growing leaves. The cotyledon is not included in the embryonic axis; it is located between the plumule and the radicle (s).To learn more about eudicots refer to:
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which of the following is not a function of lysosomes? question 6 options: digesting particles taken in by endocytosis b) degrading worn-out or nonfunctional organelles help in the formation of cell membranes d) breaking down bone to release calcium ions into the blood
The following is not a function of lysosomes : forming acid hydrolases which are necessary to help form cell membranes.
Lysosomes serve as the digestive system of the cell, breaking down materials ingested from outside the cell and digesting old components of the cell itself.
Lysosomes are organelles that accommodate hydrolytic enzymes. Hydrolases can break down unwanted components of cells, such as proteins, lipids, and carbohydrates that form cell debris. Cellular components that are not required for other cellular functions move to lysosomes, where they are degraded.
Lysosomes have three main functions: Breakdown/digestion of macromolecules (carbohydrates, lipids, proteins, nucleic acids), repair of cell membranes and response to foreign substances such as bacteria, viruses and other antigens. An important function of lysosomes is the digestion and removal of waste. Cellular debris or foreign bodies are drawn into cells through the process of endocytosis.
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Complete question :
Which of the following is NOT a function of lysosomes?
A) forming acid hydrolases which are necessary to help form cell membranes
B) degrading worn-out or nonfunctional organelles
C) breaking down bone to release calcium ions into the blood
D) digesting particles taken in by endocytosis
what terms refers to the sacs that develop in the weakened areas of the intestinal wall? group of answer choices constipation ulcers colitis diverticula diarrhea
The term that refers to the sacs that develop in the weakened areas of the intestinal wall is "diverticula."
Diverticula are small pouch-like structures that bulge out from the intestinal wall. They can occur in any part of the gastrointestinal tract, but are most commonly found in the colon. Diverticula are typically caused by an increase in pressure inside the intestines, which can be due to factors such as constipation or straining during bowel movements.
They can lead to a variety of symptoms, including abdominal pain and discomfort, bloating, and diarrhea. In some cases, diverticula can also become infected or inflamed, leading to a condition called diverticulitis. If left untreated, diverticulitis can cause serious complications and may require surgery.
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what are the three primary macronutrient elements that plants need?
Answer:
Nitrogen (N), Phosphorus (P), and Potassium (K).
why do clouds usually form at the leading edge of a cold air mass?
Clouds usually form at the leading edge of a cold air mass because of the process of frontogenesis.
Frontogenesis is the process of creating a front or boundary between two contrasting air masses. When a cold air mass moves into an area with warmer air, the warmer air rises over the colder air. This rising of the warmer air cools and condenses into clouds. The clouds are an indicator of the boundary or front between the two air masses.
The contrast in temperature between the two air masses causes the air to become unstable, which leads to rising air and cloud formation. The clouds form along the leading edge of the cold air mass because it is the area where the two air masses meet and the instability is greatest. This instability is what drives the cloud formation and provides the energy needed for the clouds to grow and develop.
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it is now thought that early life may have had genetic information encoded in?
With the exception of a few viruses, the majority of living things employ RNA to carry out the genetic instructions recorded in DNA.
However, it has long been believed by many who study the origins of life that RNA was the original genetic material. The DNA's linear nucleotide sequence contains the genetic information.
A hydrogen bond between the G-C and A-T base pairs holds the two complementary strands of nucleotides that make up each DNA molecule's double helix together. Since RNA appears to have been the earliest molecule involved in heredity, it had all the necessary mechanisms for storing and expressing genetic information before DNA even appeared on the scene.
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how do humboldt squids communicate with each other?
Humboldt squids communicate with each other primarily through a process called bioluminescence, which involves the "flashing" of light patterns to send signals to other squids.
What is bioluminescence?Bioluminescence is a natural phenomenon in which living organisms are able to produce light. This light is created through a chemical reaction involving a molecule called luciferin, which is converted into oxyluciferin and released in the form of light. Bioluminescence is found in many organisms, including bacteria, fungi, and some marine animals. Many species of marine animals use bioluminescence for a variety of purposes, including communication, camouflage, and attracting prey. Bioluminescence has also been found in some land-based species including fireflies.
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the chemical equation summarizes what happens during cellular respiration.
c6H12O6(Sugar) + O2(Oxygen)> thermal energy +H2O (Water)+CO2 (carbon dioxide).
How does the equation BEST support the idea that, as matter flows between systems , elements are recombined in different ways?
A. It shows that sugar and oxygen contain the same type of atoms as water and carbon dioxide?
B. Each side of the arrow includes two different types of matter?
C.Thermal energy appears on the same side as sugar and oxygen?
D.The arrow appears between the oxygen and thermal energy?
Answer:
A
Explanation:
Cellular respiration is a metabolic process by which glucose (a type of sugar) is broken down to produced ATP (energy).
We see that on the left side of the reaction, sugar contains carbon, hydrogen, and oxygen atoms. The oxygen gas obviously consists of oxygen atoms as well. On the right side of the reaction, water and carbon dioxide also consists of carbon, hydrogen, and oxygen atoms. This demonstrates that in things are broken down and take on news forms ("elements are recombined in different ways").
Answer B has no relevance as to how elements are recombined. Answer C only comments on the thermal energy being produced. Answer D again comments only on parts of the reaction (oxygen and thermal energy).
So the answer is A.
The equation shows that the same elements are present on both sides of the arrow, but they are recombined in different ways. Hence the correct option is A.
Sugar and oxygen are recombined to form water and carbon dioxide. This shows that matter flows between systems and is recombined in different ways.
The chemical equation for cellular respiration is:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP
According to this equation, carbon dioxide (CO₂) and water are created when sugar (C₆H₁₂O₆) and oxygen (O₂) are united again (H₂O). The energy created during cellular respiration is represented by the term ATP in the equation.
The fact that the identical components are on both sides of the arrow is crucial to keep in mind. The arrow's left side shows carbon (C), hydrogen (H), and oxygen (O). Carbon, hydrogen, and oxygen are likewise shown on the right side of the arrow (O). On the two sides of the arrow, the components are mixed differently.
The carbon, hydrogen, and oxygen atoms come together to create a sugar molecule on the left side of the arrow. The carbon, hydrogen, and oxygen atoms combine to generate carbon dioxide and water molecules on the right side of the arrow.
This demonstrates how matter moves between systems and is put together in various ways. Energy is released during the breakdown of the sugar molecule into carbon dioxide and water molecules.
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what flies will you be scoring for sex and phenotype using the dissecting microscope in this week's lab?
Typically, the flies that are scored in this way are fruit flies (Drosophila melanogaster), which are widely used as model organisms in genetic and developmental research.
What is phenotype?The visible characteristics of an individual, such as height, eye color, and blood type, are referred to as phenotypes. Both a person's genetic composition (genotype) and environmental circumstances influence their phenotype. A genotype is a classification of the kind of variation found at a certain position (i.e., a locus) in the genome. Symbols can be used to symbolize it. For example, the letters BB, Bb, bb might be used to indicate a specific mutation of a gene.
Here,
To score phenotype, the researcher may examine the external characteristics of the flies, such as wing size, body shape, and eye color, which are often controlled by specific genes. By scoring the phenotype of large numbers of individuals, the researcher can determine the frequency of different traits and how they are passed from one generation to the next.
It's important to note that the specific flies and phenotypic traits being scored will depend on the goals of the experiment and the specific questions being studied.
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When we hold a bowl of ice
cream and our hands get cold,
what is happening?
A. The heat from our hands is warming the
ice cream by radiation.
B. The heat from our hands is warming the
ice cream by conduction.
C. The heat from our hands is warming the
ice cream by convection.
Answer:
B. The heat from our hands is warming the ice cream by conduction.
Explanation:
Conduction is the direct passage of heat energy between two things. In this situation, the ice cream is receiving heat energy from your hands, melting it and making your hands feel cold. Heat energy is transferred through conduction when the ice cream is cold enough to allow your hands' heat energy to flow into it.
Answer: B
Explanation: The heat from our hands is warming the ice cream by conduction.
avian influenza ha binds more tightly to 2,3-linked sialic acid. why are humans less susceptible to infection by avian influenza than they are to human adapted flu viruses?
Humans less susceptible to infection by avian influenza because human-adapted influenza viruses bind more tightly to the 2,6-linked sialic acid that is present on the surface of cells in the human respiratory tract.
Avian influenza viruses bind more tightly to 2,3-linked sialic acid, which is a type of sugar molecule that is present on the surface of cells in the respiratory tract of birds. This tight binding to 2,3-linked sialic acid is one of the reasons why avian influenza viruses are able to infect birds so effectively.
When an avian influenza virus infects a human, it may not bind as tightly to the 2,6-linked sialic acid on human cells as it would to the 2,3-linked sialic acid on bird cells. As a result, the virus may not be able to replicate as efficiently in human cells and may not cause as severe an illness as a human-adapted influenza virus would.
It is important to note that some avian influenza viruses can cause serious illness in humans and that the severity of illness can vary depending on the specific strain of avian influenza virus and the health of the person who is infected. For this reason, it is important to take precautions to prevent the spread of avian influenza viruses, such as avoiding close contact with infected birds, washing your hands frequently, and wearing protective clothing when handling poultry.
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each chain of hemoglobin can be viewed as existing in either the r state or the t state. what is the relationship between these two hemoglobin states and oxygen binding?
The relationship between these two hemoglobin states and oxygen binding is that Hemoglobin moves from the T state to the R state through oxygen binding.
The quaternary structures of oxy- and deoxyhemoglobin are referred to as R (relaxed form) and T (tight form).
The C-terminal arginine carboxyl group of alpha-1 with an amino group of lysine (132nd residue) in alpha-2 and C-terminal arginine carboxyl group of alpha-1 with the carboxyl group of aspartic acid (131st residue) in alpha-2 maintain the T conformation of deoxyhemoglobin. Oxyhemoglobin does not have these alpha-1 and alpha-2 bridges. The salt bridges are disrupted as the T form transforms into the R form during oxygen uptake. The subunits of hemoglobin are moved around. The alpha1-beta2 interface moves during oxygenation. Slippage occurs between the two subunits. The iron is now more tightly bound to oxygen. As a result, the R form is more receptive to oxygen.
The affinity for oxygen is decreased when 2,3-BPG is bound at a site other than the oxygen binding site.
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How do scientists use recombinant DNA biotechnology to alter a cell's protein production?
They create duplicates of the cell's genome within its nucleus.
They insert a gene from another organism into the cell's genome.
They remove genes for certain proteins from the cell's genome.
They introduce other proteins into the cell to teach it.
Scientists use recombinant DNA biotechnology to alter a cell's protein production by inserting a gene from another organism into the cell's genome. Hence, option B is correct.
What is recombinant DNA?Recombinant DNA technology entails changing genetic material outside of an organism to produce living things or products with improved and desired traits. With the help of the right vector, this approach includes inserting DNA fragments from various sources with desired gene sequences.
Recombinant DNA is used in the production of various antibiotics, vaccines, transgenic plants, and transgenic animals.
With the help of the right vector, this approach includes inserting DNA fragments from various sources with desired gene sequences. Thus, option B is correct.
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List three components of the cardiovascular system.
Diffusion1.If you could add channels to the membrane that make it permeable to peptides and water, what do you think would happen to the peptide and water molecules in the cell?2. If, after adding those channels, you were to wait long enough for the system to equilibrate (i.e., reach a stable state in which the number and type of molecule in each compartment no longer changes much over time), about how many peptide molecules would you expect to find on the left side of the cell and how many on the right? How about the water molecules? currently there are 40 on the left and 80 peptide molecules on the right
Diffusion 1.Channels permeable to peptides and water can equalize the concentration of water and peptides in and out of cells.
Diffusion 2.In equilibrium, water molecules and peptides are equal on both sides.
The net movement of anything (such as atoms, ions, molecules, or energy) from a location of higher concentration to a region of lower concentration is known as diffusion. A gradient in the Gibbs free energy or chemical potential drives diffusion.
As with spinodal decomposition, it is conceivable for molecules to diffuse "uphill" from an area of lower concentration to one of greater concentration. Due to the spreading entity's intrinsic unpredictability, diffusion is a stochastic process that may be utilised to mimic a variety of stochastic situations that occur in real life.
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the indicated pathways carry impulses of discriminative touch. 2. precise pressure. 3. conscious proprioception.
The indicated pathways carry impulses of discriminative touch, precise pressure, conscious proprioception.
What is the mechanism of conscious proprioception?There are parallel pathways, some of which are used for conscious proprioception and others for subconscious proprioception. The dorsal column primarily transmits conscious proprioception, with some assistance from the spinocervical tract. The last organ of perception for position sense is the brain's sensory cortex. Proprioception, also known as kinesthesia, is the ability to recognise the position, motion, and function of different body parts. It includes a wide range of sensations, such as the perception of joint position and movement, muscle force, and effort. Fine touch, also known as discriminative touch, allows a subject to detect and localise touch. A crude touch is one that lacks localisation.
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The complete question is: Which pathways carry impulses of discriminative touch, precise pressure, and conscious proprioception?
When dissolved in water, glucose (corn syrup) and fructose (fruit sugar) exist in equilibrium as follow: fructose ⇌ glucose A chemist prepared a 0. 244 M solution of fructose at 25°C. At equilibrium it was found that its concentration had decreased to 0. 163 M. Calculate the equilibrium constant for the reaction
The equilibrium constant for the reaction between glucose and fructose in water at 25°C is 0.0666
The reaction between glucose and fructose in water can be represented by the following equilibrium equation:
Fructose ⇌ Glucose
Let's call the equilibrium constant for this reaction Kc. The equation for Kc is given by:
Kc = [Glucose] / [Fructose]
At equilibrium, the concentration of fructose has decreased from 0.244 M to 0.163 M, so [Fructose] = 0.163 M. The concentration of glucose at equilibrium can be determined from the initial concentration of fructose and the equilibrium constant:
[Glucose] = Kc * [Fructose]
Plugging in the values, we have:
[Glucose] = Kc * 0.163 M
Kc = [Glucose] / 0.163 M
Kc = [Glucose] / [Fructose] = 0.163 M / 0.244 M = 0.0666...
So, the equilibrium constant for the reaction between glucose and fructose in water at 25°C is 0.0666
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Reading a Gene Map
How often two genes cross-
over can tell us how fer apart
the genes are from each
other. This is called
recombinant frequency (rf).
These calculations allow us
to create a gene map like
this one
Circle in red the two genes
that are closest together.
Underline in green the pair
of genes that are furthest
apart
Genes that are closer
together on the
chromosome are more likely
to be inherited together. Put
a blue X through the gene
that is most likely to be
inherited with vestigial
wangs
Location
0.0 Aristaless (no bristles on antenna)
1.3 Star eye
31.0 Dachs (short legs)
51.0 Reduced bristles
57.5 Cinnabar eye
67.0 Vestigial (small) wing
99.2 Arc (bent wings]
107.0 Speck body
Chromosome
ALARME ELE
0
FULL DELE
898928895
130
Based on the gene map, the two genes that are closest together are Aristaless (0.0) and Star eye (1.3), so these two genes can be circled in red.
The pair of genes that are furthest apart are Aristaless (0.0) and Vestigial (67.0) wing, so these two genes can be underlined in green.
The gene that is most likely to be inherited with Vestigial wing is Reduced bristles (51.0), which can be marked with a blue X.
What is a gene?A gene is a segment of DNA that carries information needed to produce a specific protein, which in turn determines specific traits in an organism. Genes control the physical and functional characteristics of an organism, from eye color to disease resistance. They act as a set of instructions for the development and function of cells and tissues. Genes are made up of sequences of four chemical bases: adenine (A), cytosine (C), guanine (G), and thymine (T).
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a. sodium and potassium are involved in co-transport. b. nucleotides enter the cell by facilitated diffusion. c. glucose enters the cell by simple diffusion.
The information supports the following: nucleotides enter the cell through facilitated diffusion and sodium and potassium are involved in co-transport.
How do nucleotides work?A nucleotide is a name for the essential element of nucleic acids (RNA and DNA). A nucleotide is made up of a sugar molecule (either deoxyribose or ribose in the case of RNA), a phosphate group, and a base that includes nitrogen.
The nucleotides of DNA are adenine (A), cytosine (C), guanine (G), and thymine (T) (T). Uracil (U), a nucleotide, takes the role of thymine in RNA. The polymeric DNA and RNA molecules are constructed from long strands of nucleotides. Nucleotide. Chains of these nucleotides serve as the informational building blocks for RNA and DNA.
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Correct question:
Which of the following is supported by the information in the figure?
Choose one or more:
A. Sodium and potassium are involved in co-transport.
B. Nucleotides enter the cell by facilitated diffusion.
C. Glucose enters the cell by simple diffusion.
you are examining specimens of two different bacteria. bacteria reproduce asexually. you got one set of specimens from freshwater and one from brackish water (somewhat salty). which species concept(s) can you not use?
Bacteria reproduce in general with the aid of using binary fission, an asexual system wherein a single cell divides into two.
Under perfect situations a few bacterial species can also additionally divide each 10–15 minutes—a doubling of the populace at those time intervals. Even though micro organism are single-celled prokaryotic creatures, they do now no longer have a male or girl counterpart. Bacteria reproduce asexually. They additionally display the alternate of DNA thru conjugation, transformation and transduction. Bacteria are unicellular, microscopic organisms, that have been grouped as prokaryotes, because of this that those organisms lack a real nucleus. These microscopic organisms reproduce with the aid of using asexual techniques only.
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A rat is trained to press a lever for a small amount of food. While pressing the lever at a steady rate, the rat is presented with a tone that had been previously paired with foot-shock. When the tone is on, the rat decreases its rate of lever pressing. This decrease is an example of
The decrease in the rate of pressing the lever after the tone has been paired with foot shock is an example of conditioned suppression.
The phenomenon in which the rate of responding is reduced during a stimulus that is paired with noncontingent shock is called conditioned suppression. During the process where the rat is pressing the lever for food, the rat is occasionally exposed to a series of brief electric shocks that are preceded by a tone which is a conditioned stimulus. So, the rat hears the tone so its rate of lever pressing is also reduced. Conditioned suppression is also used to study classical conditioning. A stimulus that elicits a response after repeatedly being paired with an unconditional stimulus. This phenomenon occurs during an operant performance test where the response to a stimulus is reduced by another stimulus.
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in the modern world many countries with kings or queens have enolved into constitutional democracies, monarchs are mostly?
.
In the modern world, many countries with kings or queens have evolved into constitutional democracies, and the role of the monarch has evolved over time from that of a politically important figure to one that is more symbolic and ceremonial.
What is the significance of the monarchy?The monarchy is limited by a written constitution, the principle of the rule of law in the modern world, and representing the country at official events and ceremonies, which vary from country to country.
Hence, in the modern world, many countries with kings or queens have evolved into constitutional democracies, and the role of the monarch has evolved over time from that of a politically important figure to one that is more symbolic and ceremonial.
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what would be the expected orientation of an amphipathic alpha helix occurring in a globular protein in aqueous solution?
Because the surface of a soluble protein will contain a large number of hydrophilic amino acids, the helix will be configured so that the hydrophilic side faces the protein's exterior.
What do we mean by amphipathic alpha helix?The amphipathic alpha helix is a common secondary structural motif in biologically active peptides and proteins. An amphipathic helix is an alpha helix with opposing polar and nonpolar faces oriented along the helix's long axis. Amphipathic -helices on the outside and hydrophobic helices on the inside of a water-soluble globular protein. Antibacterial peptides and membrane protein domains involved in membrane environment sensing use amphipathic helices as targets. Amphipathic molecules are those that contain both polar and non-polar components. Phospholipids, for example, contain polar phosphate ""heads" and non-polar fatty acid "tails". " The "polarity" of molecules is an important property that governs how they interact with other molecules.
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a heterozygous tall pea plant is allowed to self-fertilize. from the f1 progeny, a phenotypically tall plant was randomly chosen and mated to a phenotypically dwarf pea plant. what is the probability of producing any phenotypically dwarf plants from this mating?
The probability of producing any phenotypically dwarf plants from this mating is 0%.
The probability of producing phenotypically dwarf plants from the cross between a heterozygous tall pea plant (Tt) and a dwarf pea plant (tt) can be calculated using a Punnett square. The Punnett square shows the possible offspring genotypes and their corresponding phenotypes that can result from a cross between two parents.
T t
T TT Tt
t Tt tt
The heterozygous tall pea plant (Tt) has a 50% chance of passing on either the dominant tall allele (T) or the recessive dwarf allele (t) to its offspring. The dwarf pea plant (tt) can only pass on the recessive dwarf allele (t) to its offspring.
When the tall parent (Tt) and the dwarf parent (tt) are crossed, the resulting offspring will all have the genotype Tt. Since the tall allele (T) is dominant, all of the offspring will have the tall phenotype, regardless of the presence of the dwarf allele (t).
Therefore, the probability of producing any phenotypically dwarf plants from this mating is 0%.
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how can reproductive barriers form between sympatric populations while their members stay in contact with them?
Reproductive barriers form between sympatric populations while their members stay in contact with them by gene pool changes establish reproductive barriers between two populations. Hence, Option B is the correct answer.
What do we mean by sympatric populations?When two related species or populations coexist in the same area and frequently interact, they are said to be sympatric in biology. A sympatric speciation occurs when a population interbreeds and then divides into two or more distinct species that live in close proximity to one another.
Sympatry refers to populations, varieties, or species that occur in the same location at the same time. An example of sympatric speciation is the apple maggot, an insect that lays its eggs inside apple fruit and causes it to rot. As the apple falls from the tree, the maggots burrow into the ground and emerge as flies several months later.
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The complete question is: How can reproductive barriers form between sympatric populations while maintaining contact between their members?
What impact has the ladybug had on the native ecosystem? If there has not been an impact seen yet, what do you think could be a potential impact?
when the genes of a small subset of a larger population are inherited over time by a large number of descendants it is known as
General. The founder effect is a type of genetic drift that occurs when a tiny group within a population breaks away from the parent population and develops a new one.
The fish in the flash flood split from the main population and created a new population in a neighboring lake. This is an illustration of the founder effect. Because the incident was random and the survivors survived owing to random chance, the drought lake is the finest example of the Bottleneck effect.
Evolution is the process through which organism populations change over generations. These modifications are caused by genetic differences.
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an ecologist observes a population of beetles that has arrived on an island from a nearby continent. compared to the continental population the island population are all very similar looking. what is the name of the effect he/she observed?
An ecologist observes a population of beetles that has arrived on an island from a nearby continent. compared to the continental population the island population are all very similar looking. The name of the effect he/she observed is Natural selection.
Natural selection is one process of evolution. More environment-adapted creatures have a higher chance of surviving and dispersing the genes that made them successful. As a result of this process, species evolve and diverge over time.
Natural selection is one theory for why there are so many species on Earth today.
With a co-publication on the theory in 1858, Charles Darwin (1809-1882) and Alfred Russel Wallace (1823-1913) are jointly credited with having developed it. Since the release of On the Origin of Species in 1859, Darwin has, however, generally eclipsed Wallace.
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why are cell walls necessary in plant cells but not in animal cells?
Plant cell needs cell wall,animal cell do not because the plants need rigid structure so that they can grow up and out . All cells have cell membranes, and the membranes are flexible. So animal cells can have various shapes, but plant cells only have the shapes of their cell walls.