Question

bonus a widows peak hairline is dominant (w) to a straight hairline (w). karen and her brother both have a straight hairline, but her parents and sister all have a widows peak. complete the punnett square that shows karens family.

phenotype
probability (%)
widows peak hairline
straight hairline

Explanation:

Step1: Determine parents' genotypes

Since Karen and her brother have a straight hairline (ww), their parents must both be carriers. So, parents' genotypes are Ww.

Step2: Create Punnett square

Parents: Ww × Ww

	W	w
w	Ww	ww

Step3: Calculate probabilities

For widow's peak (WW or Ww): 3 out of 4 = 75%
For straight hairline (ww): 1 out of 4 = 25%

Answer:

Widow's Peak Hairline: 75%
Straight Hairline: 25%