Also in Drosophila grimshawi females may have very different numbers of offsprin

Question

Also in Drosophila grimshawi females may have very different numbers of offspring. Compare two populations of these Drosophila that both have the same effective population size calculated in #4. What is the effect of variation in family size on effective population size if in one population the mean family size is 10 offspring with a variance of 3.5 and in the other population the mean family size is 10 offspring with a variance of 1.5.

If you could explain what formula you use for this and why, that would be greatly appreciated. I missed the class that the professor went over this.

Explanation / Answer

the effect of variation in family size on effective population size is given by the following formula:

Ne = 4N /(Vk +2)

where Vk is the variance when the mean family size(k) is 10

Calculation for 1st population: Ne = (4 x 80)/(3.5 +2) = 58.18

Calculation for the other population: Ne = (4 x 80)/(1.5 +2) = 91.43

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