A mother and a father have four children (biological not adopted). All four children have blue eyes. Assuming that brown eyes is a dominant trait and blue eyes is a recessive trait, which of the following statements must be true?
A) The parents may have brown or blue eyes, but both must have at least one allele for blue eyes.
B) The parents may have brown or blue eyes, but both must have at least one allele for brown eyes.
C) At least one of the parents must have blue eyes.
D) Both of the parents must have blue eyes.

Question

Quizplus · Accepted Answer

For a recessive trait to be expressed, a child must inherit two recessive alleles. Thus, for a child to have blue eyes, both parents must have at least one recessive allele (i.e., allele for blue eyes).

A Mother and a Father Have Four Children (Biological Not