Carrie has two alleles for red hair, and she has red hair. Which of the following statements is true about Carrie?

Question

Quizplus · Accepted Answer

If Carrie has two alleles for red hair and exhibits the trait of red hair, she must be homozygous for the gene. This means that both of her alleles are the same and she inherited the red hair gene from both of her parents. Therefore, her phenotype (red hair) matches her genotype (two alleles for red hair). Additionally, the fact that she has red hair indicates that the gene for red hair is expressed, meaning that it is either dominant or codominant. However, we cannot determine from this information whether the gene is dominant or codominant, so statement C is not necessarily true.

Carrie Has Two Alleles for Red Hair, and She Has