If you have two parents with the genotype Aa, what is the chance that they will have an offspring with the genotype AA?
A) one-eighth
B) one-half
C) one-fourth
D) one-sixteenth

Question

Quizplus · Accepted Answer

Each parent has one dominant A allele and one recessive a allele. When they reproduce, each parent can contribute either the dominant A allele or the recessive a allele to their offspring. The possible combinations for their offspring are AA, Aa, Aa, and aa. Since AA requires both parents to contribute the dominant A allele, the chance of having an AA offspring is 1 out of 4 or 25%, which is equivalent to one-fourth. Therefore the correct answer is C) one-fourth.

If You Have Two Parents with the Genotype Aa, What