2. Evolution of Biston betularia Color differences between the light (peppered)

Question

2. Evolution of Biston betularia Color differences between the light (peppered) and dark (melanic) morphs in this species are 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 and 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. Peppered CC 60 18 Melanic LC,C Numbers released Numbers recaptured 140 Deanend Woods Unpolluted) Melanic CC, C Numbers released Numbers recaptured32 Peppered c 60 53 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) p.43 GENOTYPES Absolute viability Relative viability Selection coefficient (s) 0.8

Explanation / Answer

Answer.

Bermingham

Deaned woods

Question 2A.

Answer.

Bermingham

p( Frequency of C allele) = 0.70 , q(Frequency of c allele) = 0.30

p2( Frequency CC genotype ) = 0.70 X 0.70 = 0.49 = 490 individuals

q2( Frequency cc genotype ) = 0.30X 0.30 = 0.09 = 9 individuals  

2pq ( Frequency of Cc genotype ) = 2 X 0.70 X 0.30 = 0.42 = 420 individuals

Now frequency of C allele = 2 x 490 + 420 / 2 x 919 = 1400/ 1838 = 0.76.

CC Cc cc Absolute Viability 140/200 = 0.70 140/200 = 0.70 18/60 = 0.30 Relative viability 0.70/0.70 = 1 0.70 /0.70 = 1 0.30/0.70 = 0.4285 (~0.43) Selection coefficient 0 0 1- 0.43 = 0.57

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