Answer:
2.2
Explanation:
Since all of the mice in the F1 generation are heterozygous for both traits, they contain a copy of each on separate chromosomes. (AB on one from parent 1 and ab on the other from the parent 2.) If these chromosomes split away from each other without crossing over, the F2 offspring can ONLY by AABB or aabb. This means that any heterozygous combinations are the result of crossing over and must be counted. When all are counted, we get a total of 11, or 2.2 per cross.
To calculate the mean number per cross of the offspring that result of crossing over, we need to make an addition of individuals that result from crossing-over, and divide the result by the number of crosses. The result is 2.2.
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According to the statement, crosses were as follow
Cross 1) Between two true-breeding
Parentals) LLBB x llbb
F1) 100% LlBb
Cross 2) Between two dihybrids
Parentals) LlBb x LlBb
The results of the F2 are
Phenotype Cross1 Cross2 Cross3 Cross4 Cross5
Long-Black 6 5 5 6 7
Long-White 1 1 0 2 2
Short-Black 0 2 1 1 1
Short-White 2 3 3 2 2
If there is no crossing-over, offspring will have the same chromosomes as parentals, which are Long-Black (LB) or Short-White (lb), because these chromosomes separate without interchanging segments.
However, if there is crossing over, these chromosomes interchange segments, and the result is Long-White (Lb) and short-black (lB).
So now, we need to count how many individuals from the F2 are a result of crossing-over.
Phenotype Cross1 Cross2 Cross3 Cross4 Cross5 Total
Long-White 1 1 0 2 2 6Short-Black 0 2 1 1 1 511
Eleven individuals result from crossing over. But we need to calculate the mean number per cross.
So, since there are 5 crosses, we need to divide the total number of individuals that are the result of crossing over by the total number of crosses.
total number of individuals = 11total number of crosses = 5Mean number per cross of F2 generation ⇒ 11/5 = 2.2
The mean number per cross of F2 generation offspring that are the result of crossing over is 2.2
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COMPETITION AND RELATIONSHIPS:
1. _______ competition is when two species that are prey to the same predator
compete. It can be considered the competition of survival.
A. indirect
B. Apparent
C. Interference
D. Exploitative
why do the cells that make up multicellular organisms need to reproduce? *
Answer:
To reproduce, true multicellular organisms must solve the problem of regenerating a whole organism from germ cells (i.e., sperm and egg cells), an issue that is studied in evolutionary developmental biology.
Explanation:
What animals do whales have similar characteristics too?
A. Monkeys and Gorillas
B. Bison and Pigs
C. Sharks and barracudas
Answer:
Bison and Pigs
Explanation:
According to molecular evidence, the closest living relatives of whales are, quite surprisingly, the artiodactyls a group of hoofed animals
if the moms blood type is AA and the dads blood type is BB what will the kids blood type be
Answer:
AB
Explanation:
I think because i am pretty sure it'll be 50/50
(BRAINLIEST QUESTION) Which statement best describes natural selection?
Random assortment of genes results in better characteristics in the following generations
Some live and some die in each generation Only the largest and strongest survive
The most intelligent organisms in a population will evolve and form new characteristics
The best adapted individuals survive and reproduce, which passes their genes onto the next generation
(BRAINLIEST QUESTION) The modification of species over many generations by selecting individuals with the desired traits and intentionally mating those individuals together is called:
natural selection
artificial selection
directional selection
exponential growth
Answer:
The answer to the first one is - The best adapted individuals survive and reproduce, which passes their genes onto the next generation. The answer to the second one is - artificial selection.
Select all that apply.
What do glucose, starch, and cellulose have in common?
They are all carbohydrates.
They are all related to photosynthesis.
They are various forms of sugars.
They are various forms of proteins.
Answer: They are all carbohydrates.
Explanation:
PLS HELP
What will happen over time if a population of organisms from the same species is physically separated and can't reproduce with one another?
the two populations will become different species over time due to accumulated mutations occuring in both populations
The two populations will remain the same species even as mutations occur randomly in the different populations
Answer:
Explanation:
the two populations will become different species over time due to accumulated mutations occuring in both populations
The two populations will become different species over time due to accumulated mutations occuring in both populations. Thus, option A is correct.
What are species and population?Species has been defined as the group of the potentially interfertile organisms that can be produce the fertile descendence. Organisms of the same species could live in the different areas, while the organisms of the same population use to live in only a particular area.
A population has been known as the group of the individuals of the same species that use to live in the given area. The individuals of that given population may or may not cross in order to produce the fertile descendence. Organisms of the same species that can live in the different areas, and while the organisms of the same population live in only one area.
Ecosystem has a level of the organization in which the different communities of different organisms along with their related abiotic factors, that use to interact with each other. This is a level of organization smaller than a biosphere and a biome.
Thus, option A is correct.
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Which of the following is NOT present in both prokaryotes and
eukaryotes? *
Presence of a Golgi body
Presence of DNA
Ability to maintain homeostasis
Ability to produce ribosomes
Answer:
Prokaryotes do not have a golgi
Explanation:
eukaryotes have a Golgi apparatus but prokaryotes do not
what is the overall purpose of photosynthesis
Answer:
The primary function of photosynthesis is to convert solar energy into chemical energy and then store that chemical energy for future use. For the most part, the planet’s living systems are powered by this process.
Explanation:
Please help. 50 points.
Answer:
I dont understand
Explanation:
i need more information to answer the question sorry
There are many types of proteins found in the cell membrane. These proteins interact with internal and external environment. True False
Answer:
true
Explanation:
PLEASE HELP ASAP
1. What do you think the DNA on a banana will look like?
Answer:
Nothing you won't be able to see it. It is too small.
Explanation:
Which of the following is an example of a literary text?
a.
memoirs
c.
novels
b.
plays
d.
all of the above
Please select the best answer from the choices provided
A
B
C
D
Answer:
I think the correct answer is C novels.
What are possible origins of Earth's surface and internal energy?
Answer:
The flow of heat from Earth's interior to the surface is estimated at 47±2 terawatts (TW) and comes from two main sources in roughly equal amounts: the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, and the primordial heat left over from the formation of Earth.
Why is DNA’s shape considered a “double helix,” but RNA’s structure is not considered a double helix?
Which describes the physical weathering of rock by water?
A. Water breaks down a rock into smaller pieces with the same composition as the larger rock.
B. Water dissolves rock into a solution.
C. Water carries away pieces of rock.
D. Any break down of a rock is the same as physical weathering of rock by water.
Answer:
it should be C. If not, try D.
Explanation:
Physical weathering of rock by water happens when waters affects the shape of a rock in any sort of form, such as breaking it into small pieces, breaking off a large chunk or etc.
The statement describes the physical weathering of rock by water - A. Water breaks down a rock into smaller pieces with the same composition as the larger rock.
physical weatheringis the process that breaks rocks apart without changing their chemical composition.water can contribute to the physical weathering of the rocks by is one of the reasons that can lead to cracking of rock caused by the freezing and thawing of water.Thus, The statement describes the physical weathering of rock by water - A. Water breaks down a rock into smaller pieces with the same composition as the larger rock.
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Describe the characteristics of archaebacteria
Answer:
The common characteristics of Archaebacteria known to date are these: (1) the presence of characteristic tRNAs and ribosomal RNAs; (2) the absence of peptidoglycan cell walls, with in many cases, replacement by a largely proteinaceous coat; (3) the occurrence of ether linked lipids built from phytanyl chains and (4)
Explanation:
hope it will help you
Which of the following living characteristics is found in viruses? *
A. Metabolism
B. Homeostasis
C. Growth and development
D. None of the above
Answer:
i think that the answer is B
Answer:
B. Homeostasis
Explanation:
Homeostasis is found in viruses. Hence, option (B) is the correct answer.
Why are some areas in Europe seeing a partial solar eclipse while others are observing a total solar eclipse ?
Answer:
A solar eclipse occurs when moon, sun and earth aligned and such alignment coincides at a new moon. In this alignment moon is in the between sun and earth which causes shadow over the earth.
A partial solar eclipse occur when moon, sun and earth is not exactly aligned.
Explanation:
A solar eclipse occurs when moon, sun and earth aligned and such alignment coincides at a new moon. In this alignment moon is in the between sun and earth which causes shadow over the earth.
A partial solar eclipse occur when moon, sun and earth is not exactly aligned.
Because earth is round some parts of the world can observe complete solar eclipse while some parts of the world can observe partial solar eclipse and some parts of the world simply does not observe any solar eclipse because they are having a night during that time.
What is the name of baby stars?
sirius
Explanation:
the prostate is basically a baby star l, and grows into a star through its life cycle in the same way we are born and grow.
Carbohydrates are made up of the following elements?
Nitrogen
Carbon
Hydrogen
Oxygen
Answer:carbon
Explanation:
Awnser:
Carbon is the awnser
HELP!!! Decomposers are not shown on the food web above. Explain how
decomposers help this ecosystem.
Answer:
they help the ecosysteam because its broken down matter
Explanation:
11 Food chains show the path energy flows through an ecosystem. Where
is the highest amount of energy found?
Answer:
The correct answer is D. the hawk.
Why is a microscope needed in order to study cells?
HELP ME!!!
Answer:
to small
Explanation:
the cells are to small to see with the naked eye so they need to be magnified
pls answer fasttt
What happens to transform plates?
A: The plates move apart producing destructive earthquakes.
B: As land masses move apart they pull the plates with them.
C: The heavier plate move under the lighter plate.
D: The plates move laterally past on another with vertical movements.
Answer:
A: The plates move apart producing destructive earthquakes.
Explanation:
i hope this help
Answer:
The answer is D. The plates move laterally past on another with vertical movements.
Explanation:
I took the test and this was the correct answer.
If a fish has a total of 50 chromosomes in a cell, how many chromosomes will be in each of the four haploid cells after meiosis?
Answer:
25 chromosomes
Explanation:
Squirrels exhibit altruistic behavior. This occurs when one member of the species squeals to alert the other members of
the population of a predator entering the arwa. The squealing member of the population is more likely to be noticed and
killed by the predator. Infer how this behavior likely evolved as an adaptation.
A)
Populations that exhibit altruism in its members likely allowed more
members of the group to survive and reproduce.
B)
Only the youngest or weakest members of the population exhibit altruism
in squirrels.
0)
Only the male member of the population exhibit altruism in squirrels.
D)
Squirrels who exhibit altruism are able to scare the predators away
Answer:
A Populations that exhibit altruism in its members likely allowed more members of the group to survive and reproduce.
Answer:
A Populations that exhibit altruism in its members likely allowed more members of the group to survive and reproduce.
Explanation:
2 Diseases caused by viruses
Please help me on this
A student compared diploid chromosome numbers of several species with their genome size. Which of the conclusions about the chromosome number and genome size is true?
#1
The size of the genome cannot be deduced from the number of chromosomes.
#2
The more chromosomes, the smaller the genome size.
#3
The bigger the genome size, the more chromosomes.
#4
The size of the genome is proportional to the number of chromosomes.
Answer:
The size of the genome cannot be deduced from the number of chromosomes.