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Skin color in Bohemian bullfrogs is determined by a single locus (S) such that SS =...

Skin color in Bohemian bullfrogs is determined by a single locus (S) such that SS = solid, Ss = striped, and ss = spotted. Of the Bohemians entered in the Backcountry Bullfrog Bounce, a regional frog jumping contest, 70% were solid colored, 20% were striped, and 10% were spotted. What were the gene and genotypic frequencies at the S locus for the frogs at the contest?

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Answer:

Solid = SS 70 = 140 “S” alleles

Striped = Ss 20 = 20 “S” and 20 “s” alleles are present

Spotted = ss 10 = 20 “s” alleles are present

Total alleles = 200

Total “S” alleles = 140+20 = 160

Frequency of “S” allele = 160/200 = 0.8

Total “s” alleles = 20+20 = 40

Frequency of “s” allele = 40/200 = 0.2

Three expected genotypic frequencies:.

Frequency of genotype, SS = 0.8 * 0.8 = 0.64 = 64%

Frequency of genotype, Ss = 2*0.8 *0.2 = 0.32 = 32%

Frequency of genotype, ss = 0.2 * 0.2 = 0.04 = 4%

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