An individual with the genotype Aa mates with an individual with the genotype AA.Which of the following is true?
A) These two individuals will have four offspring.
B) Half of the offspring will be Aa.
C) Twenty-five percent of the offspring will be aa.
D) Seventy-five percent of the offspring will be AA.

Question

Quizplus · Accepted Answer

When an individual with the genotype Aa mates with an individual with the genotype AA, the possible genotypes of the offspring are Aa and AA. Therefore, half of the offspring will be Aa (50%), and the other half will be AA (50%). No offspring will be aa because both parents have at least one dominant allele (A). The number of offspring is not specified in the question, so choice A cannot be determined. Similarly, choices C and D are incorrect because they do not reflect the possible outcomes of this cross.

An Individual with the Genotype Aa Mates with an Individual