A geneticist is studying the inheritance of a trait in yeast. She observes that the offspring of two parents who are homozygous dominant (CC) have a 75% chance of expressing the trait. Which of the following is the most likely genotype of the non-expressing offspring?

Core Concept

In a scenario where two parents who are homozygous dominant (CC) have offspring with a 75% chance of expressing the trait, the most likely genotype of the non-expressing offspring is Cc. This is because the non-expressing offspring are likely to be heterozygous, with one copy of the recessive allele.