A geneticist is studying the inheritance of a trait in mice. He observes that the offspring of two parents who are homozygous recessive (gg) have a 25% 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 recessive (gg) have offspring with a 25% chance of expressing the trait, the most likely genotype of the non-expressing offspring is Gg. This is because the non-expressing offspring are likely to be heterozygous, with one copy of the dominant allele.