Variation in expressivity and penetrance of genes is due to the effects of other genes and the environment.

Question

Quizplus · Accepted Answer

Variation in expressivity and penetrance of genes is influenced by interactions with other genes and the environment, which can result in different outcomes for individuals who carry the same genetic variant. For example, a gene that increases the risk of developing a disease may be more or less likely to cause the disease depending on the presence or absence of other genetic or environmental factors.

Variation in Expressivity and Penetrance of Genes Is Due to the Effects