An allele has a frequency of 40% in a population of 2 N =10 individuals. In the

Question

An allele has a frequency of 40% in a population of 2N=10 individuals. In the next generation, the allele was found to be at frequency 80% in the population. (a) Compute the probability of this change in allele frequency in a single generation if genetic drift is the only evolutionary force acting on the population. (b) Is such a large change in allele frequency in a single generation likely under a scenario where genetic drift is the only evolutionary force?

I solved part a and the answer is 0.011.

I only need help with part b) , please explain your answer. Thanks

Explanation / Answer

Yes, such a large change is possible because of two reasons:

1. Genetic drift occurs due to sampling errors of populations and thus it may change the allele freqency even after a single generation.

2. Here the initial population size is too less and thus the change in frequency may be larger as the change in frquency is almost zero in case of infinite population.

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