In a family, both parents have freckles and widow's peak. Both of these traits are dominant: F = freckles, W = widow's peak. What is the correct phenotypic ratio of the next generation if the parents were heterozygous? The order of the genotypes is: freckled with widow's peak; freckled, straight hairline; no freckles with widow's peak; no freckles, straight hairline. A) 9:3:1:1 B) 9:3:3:1 C) 9:1:1:3 D) 1:3:3:9

Question

Quizplus · Accepted Answer

The parents are heterozygous for both traits, so their genotypes are FfWw.
When we make a Punnett square, we get the following:
 
F: Freckles
f: No freckles 
W: Widow's peak
w: Straight hairline

As shown in the Punnett square, the phenotypic ratio of the offspring is 9 freckled with widow's peak : 3 freckled, straight hairline : 3 no freckles with widow's peak : 1 no freckles and straight hairline. Therefore, the correct answer is (B) 9:3:3:1.

In a Family, Both Parents Have Freckles and Widow's Peak