BIO120H1 Chapter Notes - Chapter 6: Millipede, Anaphrodisiac, Soltyrei
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BIO120H1 Full Course Notes
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Peacock tail, green, studded with eyespots: produces aerodynamic problems, attracts predators, takes metabolic energy to regrow. Tungara frogs of ca: use inflatable vocal sacs to sing, attract attention of females, but also bats and flies that prey on singing males than females. Collared lizard: males=turquoise body, females= dull gray-brown. Sexual dimorphisms: traits that vary between males and females. If traits differ, nearly always restricted to males. Selection responsible for sexually-dimorphic features: sexual selection: increases chances of individual getting a mate, only evolve if they more than offset the male"s diminished survival with increase in reproduction. Sexual selection comes in two forms: direct competition between males for access to females. When males battle out directly, win access to females by driving off competitors. Selection produces armaments: weapons, larger body size to help win contest: female choosiness among possible mates. Features like bright colours, ornaments, bowers, mating displays. Females find some traits and behaviours more attractive.
