Red foxes have three different types of coat color: red, cross, and black/silver

Question

Red foxes have three different types of coat color: red, cross, and black/silver (see the image). These coat colors are controlled by a single locus with two incompletely dominant alleles R and S). Suppose you went to Yellowstone National Park and counted how many foxes you saw of each color-phase. You see 58 red-phase (RR), 32 cross-phase (RS), and 10 black/silver-phase (SS) foxes. Given your data, can you estimate the frequency of the 'R" allele? 55% 74% It is not possible to calculate the frequency of A in this population. 38% 26% 7%

Explanation / Answer

The correct option is ..........Frequency of R allele is............... B.74%

RR...........red phase = 58 , then p2 = 58/100= 0.58

Rs.............cross phase = 32 , then 2pq =32/100 = 0.32

SS.............black/silver phase = 10 , then q2 = 10/100 = 0.1

ALLELIC frequencies

Frequency of R = p = p2 + 1/2 (2pq) = 0.58 + 1/2 (0.32) = 0.74 or 74%

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