Part I. A population undergoing natural selection would see a faster and more dr

Question

Part I. A population undergoing natural selection would see a faster and more dramatic change in allele frequency if the starting generation contained more of the allele being selected against. (True or False)

Part II. When natural selection occurs, which of the following happens? [1 pt; L1; II.B]

(a)Different genotypes contribute different numbers of offspring to the next generation.

(b)The gene pool remains the same.

(c)There are constant mutations.

(d)All of these

(a)Different genotypes contribute different numbers of offspring to the next generation.

(b)The gene pool remains the same.

(c)There are constant mutations.

(d)All of these

Explanation / Answer

Answer.

Part I. The answer is true.

Genetically stable populations (those under Hardy Weinberg equilibrium) do not evolve. Evolutionary change is undergone by genetically unstable populations. At the most basic level, evolution is the change in the allele frequencies in a population. Even if one allele on a chromosome is fluctuating, it is evolution.

When a population contains a larger frequency of an allele being selected against, then that allele will be lost from the population at a faster rate. Hence the above statement is true.

Part II

The answer is option D.

When natural selection occurs, there is a change in the allele frequency of the population. The population is not at Hardy – Weinbergy equilibrium. Therefore different genotypes contribute unequally to the population. The allele that is being selected against will contribute less to the genotype of the population.

The gene pool does not remain the same. Selection favours the organism which is most suited to survive in the environment.

Mutations could be happening during natural selections.

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