10. A moth has three alleles at a locus that controls antenna color: ?? xa and X

Question

10. A moth has three alleles at a locus that controls antenna color: ?? xa and Xs-?, is dominant to ?? and Xu xiproduces redantennae. x, is co-dominant to Xa·x,x, produces yelow antennae, X,, produces white antennae, and XX produces light yellow antennae. The phenotypic frequencies in a population are as follows: 0.16 wHITE 0.16 GHT YELLOW 0.04YELow 064 ED 0.04 YELLOw 64 RED Assume thot this population is in Hardy-Weinberg equlibrium what is the frequency of the X allele this population? a) 0.04 by 0.20 c)0.40 d) 0.32 e) 0.64 11. Keep assuming that the population described in Question 810 is in Hardy-Weinberg equilibrium what is the frequency of the X allele in this population? a 0.4 ) 0.64 c) 0.64 d) Vo.64 e) There's not enough information to figure this out

Explanation / Answer

Answer: Option A is correct.

Explanation:

H-W equilibrium:

(p+q+r) = 1

(p+q+r)^2 = 1

p2 + q2 + r2 + 2pq + 2pr + 2qr = 1

White, r2 = X3X3 = 0.16

Frequency of X3, r = 0.4

Yellow, q2 = X2X2 = 0.04

Frequency of X2, q = 0.2

Frequency of X1, p = 1 - (0.4 + 0.2)

= 0.4

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