In a population of 1000 lemmings there are two alleles for skin colour, the dominant colour being cream (C) and the recessive being white (c). 350 individuals have white skin. Use Hardy-Weinberg to predict the number of homozygous recessive individuals.
Hardy-Weinberg Principle states that in a population of randomly mating individuals:
p + q = 1
p2+2pq+q2=1
White fur = homozygous recessive = q2 = 350/100 = 0.35
Therefore q = sqrt(0.35)=0.59 (2sf)p = 1-0.59 = 0.41 (2sf)
Homozygous dominant = p2 = (0.41)2 = 0.1668
No. homozygous dominant lemmings = 0.1668 x 1000 = 167 lemmings
IO
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