In chickens a flat single comb is a recessive trait while short thick rose comb is dominant. In a particular population of chickens 45 are homozygous for the dominant trait 30 are heterozygous dominant and 25 have the recessive trait. Which expression is the correct way to calculate the frequency of the recessive allele?
A-80/100
B-80/200
C-55/100
D-55/200
E-120/200
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