In a large, sexually reproducing population with random mating with respect to p

Question

In a large, sexually reproducing population with random mating with respect to phenotype, the frequency of an allele changes from 20% to 60% across several generations. Based upon this change in allele frequency, the most likely cause of the change is

a. that the allele mutates readily

b. that genetic drift is responsible for the increase in the allele`s frequency

c. that the allele codes for a trait that is maladaptive in the population

d. that the allele codes for a trait that is adaptive in the population

I know answer A is wrong, but I am not sure what the correct answer is..please help and explain!

Explanation / Answer

Answer: b. that genetic drift is responsible for the increase in the allele`s frequency

Explain : If the sexually reproducing population is mating randomly, the random genetic drift leads to changes in allele frequencies, it may increase or decreases the allele frequency. In this case the allele frequency increases.

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