Question

a man with straight hair marries a woman with wavy hair. what is the chance that their first child will have wavy hair? 0% 50% 25% 75% 100%

Explanation:

Step1: Determine genotypes

Straight hair (SS), wavy hair (SW) (incomplete dominance: S=straight, W=curly; SW=wavy). Man: SS, Woman: SW.

Step2: List gametes

Man’s gametes: all S; Woman’s gametes: 50% S, 50% W.

Step3: Calculate offspring genotypes

Possible combinations: SS (S+S) or SW (S+W), each 50%. SW = wavy hair.

Step4: Find probability

Chance of SW (wavy) is 50%.

Answer:

B. 50%