The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). what is the probability of two parents heterozygous for a widow’s peak (ww) having an offspring with a widow’s peak? a) 75 percent b) 50 percent c) 0 percent d) 25 percent 

Option A, 75 percent

Explanation:

Given -

Allele for widow’s peak (W) is completely dominant over the allele for a straight hairline (w).

A cross is carried between two parents that are heterozygous for a widow’s peak

Thus, the  offspring produced by the cross between two parents with genotype "Ww" is

Ww * Ww

WW, Ww, Ww, ww

Except "ww" genotype all the remaining offspring have widow's peak.

Thus, the probability of two parents heterozygous for a widow’s peak (Ww) having an offspring with a widow’s peak is

%

Hence, option A is correct.

did you fail the test? xd

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