BIO318Y5 Lecture Notes - Lecture 9: Dung Beetle, Antagonistic Pleiotropy Hypothesis, Onthophagus
Document Summary
Evolution of senescence: fitness of lethal mutation acting at age 20 vs. one acting at age 80. Basically no fitness if you die at age 20 because at 20, people barely reproduce yet. This shows you why some animals live longer than other before they died of senescence (natural causes: what happens if this age-80 mutation enhances reproduction age 20-30 (antagonistic pleiotropy) Some benefit during reproduction age: comparing rats and bats. Rats are constantly being preyed upon so there are lots of external causes of death. Bats have wings so that it"s harder for predators to catch them. If you bring bats and mouse into the lab, the mouse would still die earlier due to senescence and bats can still for many, many years: predictions about species and sex differences. Selection of context of sexual competition: inter: between the sexes (males and females, intra: males competing directly with each other.
