2. Evolution of Biston betularia controlled by one main locus. Genotype ce is pe

Question

2. Evolution of Biston betularia controlled by one main locus. Genotype ce is peppered, whereas CC and Ce are melanic (C is completely dominant over c). In field studies conducted in the United Kingdom, moths were marked with a tiny dab of paint a Color differences between the light (peppered) and dark (melanic) morphs in nd released back into their natural environment. Two weeks later, moths were recaptured and sorted by color The table below shows the results of these studies, which were conducted at two different sites in the UK. Melanic CC,C 200 140 Peppered c 18 Peppered c Numbers released Numbers recaptured Deanend Woods Unpolluted) Melanic CC. C Numbers released 200 32 60 53 Numbers recaptured Assume that the decrease in number of each type was due to mortality and not to emigration. Use the above data to fill in the following fitness arrays GENOTYPES Cc Absolute viability Relative viability Selection coefficient (s) 1. 06 GENOTYPES Cc Absolute viability Relative viability Selection coefficient (s) o.is 0,8

Explanation / Answer

Since the frequency of allele C is 0.4, the frequency of allele C is 1 – 0.4 = 0.6.

When the population is in Hardy-Weinberg equilibrium:

The frequency of CC individuals is (0.4)(0.4) = 0.16
The frequency of Cc individuals is 2(0.6)(0.4) = 0.48
The frequency of cc individuals is (0.6)(0.6) = 0.36

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