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 the allele for curly hair be \(C\) (dominant) and for straight hair be \(c\) (recessive). The mother is \(CC\) (homozygous curly - haired) and the father is \(cc\) (homozygous straight - haired).

Step2: Determine gametes

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

Step3: Use Punnett - square analysis

When we cross \(CC\times cc\), all of the offspring will have the genotype \(Cc\). Since curly hair (\(C\)) is completely dominant over straight hair (\(c\)), all of the offspring will have curly hair and none will have straight hair. So 0% of the offspring will exhibit characteristics of both parents. But if we assume the question means having the genotype of both parents (which is not possible in a simple cross like this), still the answer is 0%. Among the given options, the closest correct - like situation (if we consider the spirit of the question about getting traits from both) is when we realize that the offspring will have the dominant trait of the mother and not the recessive trait of the father at all. So the percentage of offspring with traits of both parents is 0%, and the closest option to 0% among the given ones is 25 percent (assuming some mis - understanding in the question setup as 0% is not an option).

Answer:

25 percent