Question

the allele for curly hair is incompletely dominant. if a mother is homozygous for curly hair and the father is homozygous for straight hair, what percentage of the offspring will exhibit characteristics of both parents?
25 percent
50 percent
75 percent
100 percent

Explanation:

Step1: Define Genotypes

Let’s denote the allele for curly hair as \( C \) (homozygous curly: \( CC \)) and straight hair as \( S \) (homozygous straight: \( SS \)).

Step2: Determine Gametes

Mother (\( CC \)) produces only \( C \) gametes. Father (\( SS \)) produces only \( S \) gametes.

Step3: Predict Offspring Genotype

All offspring will have genotype \( CS \) (since \( C \times S \)).

Step4: Analyze Incomplete Dominance

In incomplete dominance, heterozygotes (\( CS \)) show a blend of both parental traits (exhibiting characteristics of both curly and straight hair parents). Since all offspring are \( CS \), 100% of them exhibit both parents’ characteristics.

Answer:

100 percent