Question

Consider a population of 100 diploid organisms (N = 100). Initially there are 50 copies of allele "A" and 150 copies of allele "a". Due to genetic drift, there are 57 copies of allele "A" in the next generation. Assuming that the population size is 100, what is the change in allele frequency?

Answer 1

Since the given population is made of 100 diploid organisms, we have total alleles(one from mother and one from father).

And it's given that there are 50 copies of allele "A" and 150 copies of allele "a".

So the allele frequency is

Allele	Allele frequency
A	50/200=0.25
a	150/200=0.75

And in the next generation, there are 57 copies of allele "A", i.e. (200-57)=143 copies of allele "a".

And hence the new allele frequency is

Allele	Allele frequency
A	57/200=0.285
a	143/200=0.715