BIOLOGY 1M03 Lecture Notes - Lecture 18: Missionary Position, Promiscuity, Bipedalism
18 Oct 2015
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Document Summary
All apes lack tails: taillessness is a major synamorphy. Derived traits: trait is derived if it is present in an organism, but was absent in the last common ancestor. Gibbons: occur in southeast asia; are lesser apes (are smaller and have less sexual dimorphism than the great apes) Orangutans: occur in southeast asia; live solitary (males and females have separate territories), promiscuity (males competing for access to female) Gorillas: divided into the two species of western and eastern; polygyny: live in harems (one male and many females and offspring) Chimpanzees: live in multi-male multi-female groups but in a male dominated hierarchy; promiscuity. Mating system of apes: monogamy: pair bonding, polygyny: males with more than one female, polyandry: females with more than one male, promiscuity: both males and females with more than one partner. Why the difference between bonobos and chimps: chimps and gorillas are both right bank (same area), so they compete for food, territory, and influences on social structure.
