The phenotypic variance for scutellar bristiles in a population of Drosophila is

Question

The phenotypic variance for scutellar bristiles in a population of Drosophila is .35. The population is moved to new, rigidly controlled conditions in which there is no environmental variation whatsoever. The phenotypic variance in the new conditions is .25. Assume no genotype X environment interactions.

What is the environmental variance under the old environmental conditions?

What was the heritability in the old environment?

What is the heritability in the new environment?

The mutation rate from allele A1 to allele A2 is 10^-5. The back mutation rate is 0. What is the equilibrium frequency of allele A2?

If the back mutation rate of A2 to A1 was 10^-5 what would be the equilibrium frequency of allele A2?

Explanation / Answer

VG = Vp - VE

Since there is no genotypic variation due to environmental interactions

(VG)1 = (VG)2

0.35

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