You have freckles, dimples, and a widow\'s peak (you\'re heterozygous for all th

Question

You have freckles, dimples, and a widow's peak (you're heterozygous for all three traits). Your significant other has freckles and dimples (heterozygous for these two), but a continuous hairline. Freckles are dominant over no freckle. Dimples are dominant over dimples. Widow's peak is dominant over continuous hairline (no widow's peak). a) What is the probability that your child will have all three recessives: no freckle, no dimples and a continuous hairline? Show your work below for any credit. b) What the probability that your child will have the same phenotype as you: freckles, dimples and widow's peak? Show your work below for any credit.

Explanation / Answer

Answer:

a).

FfDdWw x FfDdww ------------Parents

Ff x Ff = FF (1/4), Ff(1/2) & ff (1/4)

F_ phenotype (Frickles) = 1/4 + 1/2 = 3/4

Dd x Dd = DD (1/4), Dd (1/2) & dd (1/4)

D_ phenotype (Dimples) = 1/4 + 1/2 = 3/4

Ww x ww = Ww (1/2) & ww (1/2)

W_ phenotype (widow's peak) = 1/2

The probability of child that have all three recessive traits = 1/32

No freckles, no dimples, continuous hairline = ffddww = 1/4 * 1/4 * 1/2 = 1/32.

b).

The probability of child that have freckles, dimples and widow’s peak phenotypes =9/32

F_D_W_ = 3/4 * 3/4 * 1/2 = 9/32

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