ANT 1 Lecture Notes - Lecture 12: Hylobates, Polygynandry, Sexual Dimorphism
Document Summary
Lecture 12: sexual selection theory: sexual selection theory. It"s an evolutionary mechanism that sometimes acts in opposition to survival. Sexual selection favors traits which help an individual to succeed in competition over mates, or make an individual more likely to be chosen as a mate: mammalian sex differences in reproductive biology. It always requires one male and one female to make offspring: variance among males is larger than the variance among females. Not true for females: what limits reproductive success, genders: Females = access to resources (food, protection; it"s very costly towards the body: males = access to fertile females (more mates = more offspring) The less-investing sex will compete with each other over access to the more-investing sex (trivers 1972: the classic model of sexual selection. Indiscriminate, ardent, and aggressive males (quantity-seeking: choosy, coy, and passive females (quality-seeking, but it"s not always that simple .
