Which statement BEST describes how the model can illustrate genetic drift?

A

The frequency of the pink allele decreased between the original population and the tenth generation due to random chance.

B

The frequency of the red allele remained steady between the original population and the fifth generation due to random chance.

C

The frequency of the yellow allele decreased between the original population and the tenth generation as that trait became less beneficial for survival.

D

The frequency of the green allele remained steady and then decreased between the fifth generation and the tenth generation as that trait became less beneficial for survival.

Question

03-11-2021
Biology

contestada

Which statement BEST describes how the model can illustrate genetic drift?

A

The frequency of the pink allele decreased between the original population and the tenth generation due to random chance.

B

The frequency of the red allele remained steady between the original population and the fifth generation due to random chance.

C

The frequency of the yellow allele decreased between the original population and the tenth generation as that trait became less beneficial for survival.

D

The frequency of the green allele remained steady and then decreased between the fifth generation and the tenth generation as that trait became less beneficial for survival.

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sofiaplillo sofiaplillo · Answer 1 · 2021-11-15T14:41:44+01:00

The statement that best describes how the model can illustrate genetic drift is A: The frequency of the pink allele decreased between the original population and the tenth generation due to random chance.

As well as natural selection, genetic drift is another way in which evolution happens.

Genetic drift is a change in the frequency of an allele in a population that happens by chance, that is to say, that it does not matter if the gene is beneficial or not for the survival of the species, it will just change its frequency spreading or losing a trait in a population by random chance.

Let's see the options and which one illustrates best the genetic drift model:

Statement B: in genetic drift, the allele's frequency should not remain steady from one generation to another; that is why this is not illustrating genetic drift.

Statement C: even though there is a decrease in the frequency of an allele between generations, this is not a genetic drift since it did not happen by chance; it happened because the trait became less beneficial for survival, in other words, natural selection.

Statement D: As well as in statement C, the decrease in the frequency of the allele did not happen by chance, so it is not a genetic drift.

In conclusion, statement A is the correct option because it is the one that best illustrates genetic drift. In other words, it describes a decrease in the frequency of an allele that happened due to random chance, which is known as genetic drift.

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