Assume that eye color is a single gene trait and that brown eyes is a dominant allele and blue eyes is a recessive allele. If Harry's mother and father both have brown eyes and are both heterozygous on this trait, what is the probably that he will have brown eyes, too?
A) 100%
B) 75%
C) 25%
D) 50%

Question

Quizplus · Accepted Answer

Heterozygous refers to the arrangement in which the two alleles for a simple dominant-recessive trait differ. One possibility is that Harry could inherit a recessive allele from his father and a recessive allele from his mother, which would result in blue eyes. Alternatively, he could inherit a recessive allele from his father and a dominant allele from his mother, a dominant allele from his father and a recessive allele from his mother, or dominant alleles from both parents - all circumstances that would result in Harry having brown eyes.

Assume That Eye Color Is a Single Gene Trait and That