If heterozygotes for a certain gene have increased fitness compared to homozygotes, variation can be maintained in a population by a process called balancing selection.
Balancing selection refers to natural selection that acts to maintain genetic diversity in a population by favoring multiple alleles or different genotypes.
There are a few mechanisms through which balancing selection can occur:
1. Heterozygote advantage: In some cases, individuals with two different alleles (heterozygotes) for a particular gene have higher fitness than individuals with either of the two alleles (homozygotes).
This can result in a balanced distribution of different alleles in a population, as both alleles are maintained due to their advantages in different contexts.
2. Frequency-dependent selection: The fitness of a particular genotype depends on its frequency in the population. If the fitness of a genotype increases as its frequency decreases, and vice versa, this can lead to a balanced distribution of alleles.
Rare genotypes may have higher fitness because they have an advantage against more common genotypes, creating a dynamic equilibrium.
3. Spatial or temporal variation: Environmental conditions may vary across different geographic locations or over time. If different alleles or genotypes are favored in different environments or during different periods, genetic diversity can be maintained.
This can occur through mechanisms like habitat heterogeneity or cyclical fluctuations in selection pressures.
These mechanisms of balancing selection help to maintain genetic diversity in populations, preventing the fixation of a single allele or genotype.
By preserving variation, populations can exhibit greater adaptability and resilience to changing environments and evolutionary challenges.
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How are adaptations passed to offspring?
Group of answer choices
Adaptations skip generations in organisms. Even if one organism "learns" an adaptation, it will be their "grandchild" organism that gets it.
Adaptations are mostly random, as they are genetic. They are written in the DNA. Changes in genes are random. If a mutation happens and the offspring of two parents has a mutation, sometimes that mutation will help it live.
The parents develop during their lifetime, so their DNA changes, and when they mate, the adaptation and then pass it on to offspring
Parents purposely CHOOSE which adaptations they give to their offspring, because they can choose which half of their genes are going to go into that organism, and predict how it will mix with it's mates genes. it is planned out to ensure species survival. This is especially true in flowering plants.
In evolutionary theory, adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment. The idea of natural selection is that traits that can be passed down allow organisms to adapt to the environment better than other organisms of the same species.
Therefore, the answer is :
Adaptations are mostly random, as they are genetic. They are written in the DNA. Changes in genes are random. If a mutation happens and the offspring of two parents has a mutation, sometimes that mutation will help it live.
which statement is true about population pyramid ?
b
ОООО
ro o
in developed countries the is more old people than young
population pyramid is of 3 types, increasing, declining and stable
in industrial countries like the US the biggest age range is 15-20
non of above
с
Plant cells also gain energy through cellular respiration. True False sm
Answer:
true
Explanation:
1. Look at the five structures shown here. How do you think they are related to each other?
Answer:
They are all related to cells
Explanation:
;^; can you list the answers
DNA is a structure made up of two coiled polynucleotide chains with nitrogenous bases present in chromosomes. These chromosomes are present in the nucleus of the cell. These cells together form an organism.
What are Cells?Cell is define as the smallest unit which can live on its own and that makes up all living organisms and the tissues of the body. A cell has three main parts:
1. The cell membrane
2.The nucleus
3. The cytoplasm.
A nucleus is defined as the membrane-enclosed organelle within a cell that contains chromosomes. It is an array of pores, or pores, in the nuclear membrane that allow the selective passage of certain molecules, such as proteins and nucleic acids, into and out of the nucleus.
Chromosomes are define as the threadlike structures made of protein and a single molecule of DNA which serve to carry the genomic information from cell to cell. These DNA (Deoxyribonucleic acid) is a polymer which is composed of two polynucleotide chains that coil around each other to form a double helix consisting of nitrogenous bases.
Thus, DNA is a structure made up of two coiled polynucleotide chains with nitrogenous bases present in chromosomes. These chromosomes are present in the nucleus of the cell. These cells together form an organism.
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In a population of white (W) and black (w) sheep, 22 out of 244 sheep are black. What is the frequency of the dominant allele in the population?
Answer and Explanation:
To calculate the allele frequency in the population, we divide the number of occurrences of the particular allele by total number of all alleles in the population Allele frequencies can be represented as a decimal, a percentage, or a fraction.
Given the population of white (W) and black (w) sheep, 22 out of 244 sheep are black, the frequency of the dominant allele in the population = 222/244×100=
A scientist is studying a worm. It is three millimeters long and pointed at each end. The worm is unsegmented and has only male reproductive structures.
Which kind of worm is the scientist most likely studying?
a tapeworm
a flatworm
a roundworm
an earthworm
Answer:
i think the answer is c roundworms
Explanation:
i know im right becausee i made a 90% with this being right
Answer:
a roundworm
Explanation:
I got the answer right on quiz .
Can you guys help me get the right answer please!?❤️
Answer:
b
Explanation:
hydrotropism is when the growth or turning of plant root towards or away from moist soil
2. RNA polymerase is a type of enzyme. Enzymes help chemical reactions occur quickly. Click the Release enzyme button, and describe what happens.
Answer:
The nucleotides are split
Explanation:
With the release of enzyme, enzyme take part in the chemical reaction without utilizing in it.
When the enzyme release by any glands in the body, it attached to the substrate and speed up the chemical reaction without using in it. Once the chemical reaction ended, the enzyme which attached the substrate earlier detached and then attached other substrate in order to speed up the chemical reaction.
Without enzyme, chemical reaction occurs but at a very slower rate so we can conclude that with the release of enzyme, enzyme take part in the chemical reaction without utilizing in it.
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Which term best describes the rate at which glacial erosion takes place? HELP PLEASE!!!!!!!
Group of answer choices
Quick
Slow
Ephemeral
Sudden
Answer:
Slow
Explanation:
The rate at which glacial erosion occurs is very very slow, it is difficult to observe a glacier erosion. As there are two main processes which occurs in glacial erosion. Plucking which is defined as the erosion stage and which transports large chunks of rocks.
Which statement describes how the atmosphere gains energy by convection?(1 point)
Air warmed by the ground rises.
The ground warms the air just above it.
Solar energy warms gases that make up the air.
Energy moves from the clouds to the air.
The statement that describes how the atmosphere gains energy by convection is : Air warmed by ground rises ( A )
The rising warm air from the ground into the atmosphere explains the exchange of heat energy from the ground into the atmosphere through convection and this possible due the variation in density and temperature of the ground air and the atmospheric air.
What is ConvectionConvection is the transfer of heat energy through the movement of a medium such as air or water from one region to another. convection can occur as :
Natural convection Forced convectionHence we can conclude that The statement that describes how the atmosphere gains energy by convection is Air warmed by ground rises
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Answer:
answer :
Explanation:
Explanation:
What will happen to the speed of a wagon rolling to the right if the direction of the net force is in the opposite direction to the left?
Answer:
the speed of a wagon rolling to the right if the direction of the net force is in the opposite direction to the left would decrease the speed of the wagon
Explanation:
Answer:
The wagon's speed increases to the left. ... The acceleration of an object moving along a curved path is constantly changing even if the speed is constant, because the direction of the object constantly changes.
A scientist compares two samples of white powder. One powder was present at the beginning of an experiment. The other powder was present at the end. She wants to determine whether a chemical reaction has occurred. She finds that neither sample bubbles or dissolves in water. She measures the mass and volume of the solids. Sample one has a volume of 45 cm3 and a mass of 0.5 g. Sample two has a volume of 65 cm3 and a mass of 1.3 g. What should the scientist conclude?
A.
The samples have the same color, so no chemical reaction has occurred.
B.
The two samples do not react with water, so no chemical reaction has occurred.
C.
The densities of the samples are different, so a chemical reaction has occurred.
D.
The densities of the samples are the same, so no chemical reaction has occurred.
E.
The densities of the samples are different, so no chemical reaction has occurred.
Answer:
I think it is C because there densities are different.
Farmers have cultivated five different vegetable crops by artificially selecting for certain traits from the wild mustard plant. This table lists information about five different vegetables that originated from the wild mustard plant.
Broccoli- Suppression of flower development
Cabbage- Suppression of internode length
Kale- Enlargement of leaves
Cauliflower- Sterility of flowers
Kohlrabi- Enhancement of lateral meristems
Which statement is correct about the development of these vegetables through artificial selection?
A.
They resulted from a characteristic of the mustard plant that was changed or enhanced by the selective cultivation.
B.
They resulted from the exposure to extreme temperatures and ultraviolet sun rays.
C.
They were created over one generation when crossbreeding took place between two different varieties of vegetables.
D.
They stopped forming additional varieties at the end of a growth cycle.
Answer:
A
Explanation:
because the farmers selected certain traits to propagate
The Colorado River provides water and electricity for over 40 million people. But so much water is withdrawn from this river for agriculture/livestock and drinking water, that very little of it reaches the sea. Due to drought and overuse, it currently is drying up. This will be a major problem because crops and livestock in the USA depend on this water. What percent of the nation's crops and livestock rely on the river's water?
Answer:
About 80%
Explanation:
2. A food web explains why there are more _____. It is because more energy is available to _____. A. Decomposers than consumers / consumers b. Producers than decomposers / consumers c. Consumers than producers / producers d. Producers than consumers / producers
Answer:
D
Explanation:
A food web explains why there are more producers than consumers. It is because more energy is available to producers.
The food web is a structural representation of the feeding relationship that exists among the living organisms in a particular environment.
A typical food web groups living organisms as producers, consumers, or decomposers. Producers are those that fix sunlight energy into chemical energy, a process known as photosynthesis while consumers are those that either feed on producers or other living organisms in the environment. The decomposers return both producers and consumers back to the earth and help nutrients circulate in the environment.
In a typical food web, producers are usually more than consumers because more energy is usually available at this level. Less and less energy becomes available as we move up the ladder in each food chain that makes up the food web.
The correct option is D.
PLS HELP ME ASAP 50 POINTS EACH!!
Having dimples is a dominant trait. Having no dimples is recessive.
A father has the genotype Dd and a mother has the genotype Dd.
What is the correct phenotypic possibilties for their offspring?
100% DD, 0% Dd, 0% dd
Answer:
option D
. I hope this helps
Give advantages and disadvantages of asexual reproduction.
Answer:
Advantages and Disadvantages Of Asexual Reproduction
Advantages Of Asexual Reproduction Disadvantages Of Asexual Reproduction
The process requires less energy. Since the offspring is an exact copy of the parent, any negative mutation will also pass on to the offspring
BRAINLIEST Explain the difference between a scientific law and a scientific theory.
Answer:
A theory is a group of related hypotheses that can be accepted as true based on repeated investigations with similar results. A law is a scientific concept that explains what patterns of behavior will be seen through repeated investigations
Explanation:
sample response on edge
Which factor is needed for both thunderstorms and hurricanes to form?
Answer:
C. rising moist air
Explanation:
for the storm to start/process it needs the moist air in order for both hurricanes and thunderstorms to happen, because the rotation with the moistness creates the storms.
Hope this helps
Answer:
rising, moist air
Explanation:
because it is i got it right on my test
Which amino acids are coded for from the DNA sequence TACCAGCCA?
methionine, valine, and glycine
methionine, glutamine, and alanine
methionine, valine, and aspartic acid
arginine, histidine, and cysteine
Where do the instructions for building a protein originally come from?
tRNA
rRNA
DNA
mRNA
A _______________ is composed of a series of amino acids.
Molecule
Protein
Nucleotide
Cell
Explanation:
DNA
The instructions for building a protein originally come from DNA, which is the store for all hereditary information.
A protein is composed of a series of amino acid.
What usually happens to a population of organisms when the region's carrying capacity has been reached?
Answer:
the population starts to slowly decline
Explanation:
The population will decline drastically because there is not enough resources to sustain the population or increase the population.
Can someone help please ? With explanation whoever ans gets branilest
Answer:
This makes absolutely no sense... but I'm gonna say the green box is the correct answer... I'm most likely wrong.
Explanation
I believe the 2nd option is correct specifically because plants reproduce asexually. With the pest species eating the plants, they wouldn't get very far before being eaten. That's really the only negative option, and pests cannot really eat things that sexually reproduce...
Which of these non-renewable resources is used nowadays in vehicles to reduce pollution?Immersive Reader (1 Point) Compressed Natural Gas All of these Diesel Petrol
Answer:
Compressed Natural Gas
Explanation:
Nowadays there are a lot of car manufacturers designing cars for specific countries that run on Compressed Natural Gas. This is because burning natural gas has been proven to be much cleaner and environmentally friendly than burning petroleum or Diesel. Natural Gas produces the same energy as the other non-renewable resources used to power cars while at the same time drastically reducing all of the pollutants created by burning these resources.
what are the advantages of using petroleum-based products?
Answer:
Petroleum is extremely easy to extract. ...
It is a high-density fuel. ...
Petroleum can be transported over long distances. ...
It provides a fuel that works with our infrastructure. ...
It can be used in a wide variety of ways. ...
Petroleum provides a stable energy resource.
The majority of cellular respiration takes place in the nucleus of cells
Answer:
fALSE
it is in the mitochondria
Explanation:
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How do cells of all organisms undergo similar processes to maintain homeostasis?
Answer:bozo
Explanation:
Answer:
I feel as though you're asking, How do cells know how to maintain homeostasis?
In which case, your answer would be by reacting to internal and external stimuli.
What describes the conversion of ADP to ATP?
A)an input of energy as both phosphate groups detach
B)a release of energy as one phosphate group detached
C) a release of energy as a third phosphate group is attached
D) an input of energy to attach a third phosphate group
Answer:
D
Explanation:
The option that describes the conversion of ADP to ATP is D) an input of energy to attach a third phosphate group.
What is ADP?ADP (adenosine diphosphate) is a molecule that is made up of adenosine and two phosphate groups. ATP (adenosine triphosphate) is a molecule that is made up of adenosine and three phosphate groups. The conversion of ADP to ATP is an energy-intensive process that requires an input of energy.
The third phosphate group is attached to ADP by a process called phosphorylation. Phosphorylation is an energy-requiring reaction that uses ATP as a source of energy.
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Help me please really quick
Answer:
D. electromagnetic energy
Answer:
C
Explanation:
mixed together they make helium which would be chemical
When you buy strawberry why does "TASTE" matter? Please helppp
Taste matters because you have to enjoy the strawberry when you eat it. Unripen strawberries are very sour and are not appealing to taste. You would have a difficult time eating a sour or rotten strawberry. That is why taste matters.