Question

probability
if you have a widow’s peak hairline, where the hairline on your forehead is shaped in a downward v, then you have a dominant gene for the trait.
suppose a child’s mother has two dominant genes for a widow’s peak, but the father has no dominant genes. what is the theoretical possibility that the child will have a widow’s peak?
a. 25%
b. 50%
c. 100%
d. 0%

Explanation:

Step1: Define parental genotypes

Mother: $WW$ (homozygous dominant), Father: $ww$ (homozygous recessive)

Step2: Identify gamete options

Mother can only pass $W$, Father can only pass $w$.

Step3: Calculate offspring genotypes

All offspring get $W$ (from mother) + $w$ (from father), so genotype $Ww$.

Step4: Determine trait expression

Since $W$ is dominant, $Ww$ results in widow's peak. Probability = 100%.

Answer:

C. 100%