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 alleles

Let \(C\) represent the allele for curly - hair and \(c\) represent the allele for straight - hair. The mother is homozygous for curly hair (\(CC\)) and the father is homozygous for straight hair (\(cc\)).

Step2: Determine gametes

The mother can only produce gametes with the \(C\) allele, and the father can only produce gametes with the \(c\) allele.

Step3: Create a Punnett - square

When we cross \(CC\times cc\), all of the offspring will have the genotype \(Cc\).

Step4: Analyze incomplete dominance

In incomplete dominance, the heterozygous genotype (\(Cc\)) exhibits a phenotype that is a blend of the two homozygous phenotypes. So, all offspring (\(100\%\)) with the genotype \(Cc\) will exhibit characteristics of both parents.

Answer:

D. 100 percent