If you have two parents with the genotype Aa, what is the chance that they will have an offspring with the genotype AA?
A) 1/8
B) 1/2
C) 1/4
D) 1/16

Question

Quizplus · Accepted Answer

When two parents with the genotype Aa have offspring, each parent can pass on either an A or an a allele. Therefore, each parent has a 50% chance of passing on an A allele to their offspring. To have an offspring with the genotype AA, both parents would have to pass on an A allele. This would occur in 25% of their offspring, since the probability of each parent passing on an A allele is 0.5 (or 1/2), and the probability of two independent events both occurring is the product of their individual probabilities (0.5 x 0.5 = 0.25, or 1/4). Therefore, the chance of having an offspring with the genotype AA is 1/4 or 25%.

If You Have Two Parents with the Genotype Aa, What