Reduced penetrance and variable expressivity are factors that influence the effects of particular genetic changes. These factors usually affect disorders that have an autosomal dominant pattern of inheritance, although they are occasionally seen in disorders with an autosomal recessive inheritance pattern.enetrance refers to the proportion of people with a particular genetic change (such as a mutation in a specific gene) who exhibit signs and symptoms of a genetic disorder. If some people with the mutation do not develop features of the disorder, the condition is said to have reduced (or incomplete) penetrance.
Although men have more muscle mass than women, both sexes reach their physical peak as young adults or anywhere from their late 20's to early 30's, according to âHuman Development: A Life-Span Viewâ by Robert Kail and John Cavanaugh.
If Kinsey were looking at hormonal levels alone, heâd be largely correct about sexual peaks. In men, testosterone levels reach their apex around age 18, while womenâs estrogen (and fertility) hits a high-water mark during the mid-to late-20s.egardless of hormonal maturity or concentrations, both men and women reach their sexual peak when theyâre most comfortable with their own bodies and sexuality. And because hormones and relationships change throughout life, a so-called sexual peak can come at any time or age.