For a diploid species, assume one set of 100 demes, each with a constant size of 50 individuals, and another set of 100 demes, each with 100 individuals. (a) If in each deme the frequencies of neutral alleles A1 and A2 are 0.4 and 0.6 respectively, what fraction of demes in each set is likely to become fixed for allele A1 versus A2?

The  fraction of demes in each set is likely to become fixed for allele A1 versus A2 are

A1 = 40 demes

A2 = 60 demes

Explanation:

Fixing of an allele refers to that particular allele being solely present in the population i.e. all other allelic forms of that gene have vanished. The fraction of demes being fixed for a particular allele depend on the its frequency.

Therefore, for both sets, the fraction of demes being fixed for A1 = frequency*total number of demes = 0.4 * 100 = 40 demes

the fraction being fixed for A2 = 0.6 * 100 = 60 demes

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