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.
Contrary to popular belief, it seems women may actually reach their sexual peak before men. According to a recent survey conducted by Atlanta-based sex toy manufacturer LoveHoney, women reach their sexual peak at age 26, while men peak later - at 32. The poll, which included 1,000 adults aged 18-65, defined 'peak' as the period where participants said they were having the 'best' sex of their lives.