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MatroZZZ [7]
3 years ago
10

Scientists observe a population of squirrels over a long period of time. The scientists note that after the populations are able

to live together, the black and the brown squirrels are not able to produce fertile offspring. Which explanation best supports the scientists’ observation?
A. The squirrel population experienced more mutations living together than living.
B. The squirrel population did not have enough genetic variation to produce fertile offspring.
C. The squirrel population divided into dominant population and a recessive population of one species.
D. The squirrel populations on either sid eof the river did not experience gene flow and became two different species.

Biology
1 answer:
pickupchik [31]3 years ago
5 0

Answer:

I think answer B is correct

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B. And environmental problem should be correct
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Cell division is preceded by two growth phases. Besides growth, both G1 and G2
Leviafan [203]

Answer:

A

Explanation:

a. contain checkpoints that determine if the cycle will continue.

b. help move chromosomes to the new daughter cells.

c. produce more chromosomes before the cell divides.

d. grow and produce enough cytoplasm to fill two cells.

<em />

<em>The correct answer would be that G1 and G2 contain checkpoints that determine if the cycle will continue or otherwise.</em>

The cell cycle generally has three checkpoints that happen at G1, G2, and M phase of the cycle.

At G1 checkpoint, the integrity of the DNA of the cell is assessed to ensure that there are no damages and other conditions such as size and energy reserve are checked.

At G2 checkpoint, the cell is assessed for proper chromosome duplication to ensure that there are no mistakes or damages. The size of the cell and the amount of protein are also checked to ensure that the cell is ready for the active division phase.

At M checkpoint, correct attachment of the spindle fiber to the kinetochore of the chromosomes is checked. This checkpoint is also known as the spindle checkpoint and it happens towards the concluding phase of the metaphase stage.

<u>The correct option is therefore, A.</u>

6 0
3 years ago
Explain how these tail lengths were inherited by describing the mode of inheritance, indicating how many gene pairs were at work
emmainna [20.7K]

Here we can see that 7 phenotypes appeared in F2 generation, so the number of genes involved is 3 and alleles is 6. Contribution per allele = 4 cm Base contribution = 6 cm

Genotype of Harvey = aa bb cc Genotype of Erma = AA BB CC

Number of dominant alleles if length is

18 cm = 18-6 / 4 = 12 / 4 = 3.

F1 generation genotype = Aa Bb Cc This clarifies why the length is 18 cm, as there are three dominant alleles.

seven 1. It is likely that there are gene pairs in this cross. There are

categories of phenotypes. The genotypes of the parents would be combinations of alleles that would produce a 6 cm ( aabbcc ) tail and a 30 cm) tail, whereas the 18 cm offspring would have a genotype of AaBbcc.

learn more about phenotypes here: brainly.com/question/902712

#SPJ4

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There is only about 3 percent of freshwater on earth
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