What is the probability that an individual is Aa or AA if his or her parents are both heterozygous for the trait? A)¹/₄ B)¹/₂ C)³/₄ D)1

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When both parents are heterozygous, their genotypes would be Aa. Using a Punnett square, we can determine the possible genotypes of their offspring: A a A AA Aa a Aa aa As can be seen, there is a 25% chance of the offspring being AA (homozygous dominant) and a 50% chance of being Aa (heterozygous). Therefore, the probability of an individual being Aa or AA is 75% (25% for AA and 50% for Aa). Choice C (³/₄) reflects this probability.

What Is the Probability That an Individual Is Aa or AA