BSCI 106 Lecture Notes - Lecture 11: Mating Plug, Red Queen Hypothesis, Niche Differentiation
24 Sep 2016
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Bsci 160 lecture 11: sex and sexual selection. Two parents giving rise to genetically unique offspring through the fusion of gametes produced by meiosis. Some view sexual selection as the most significant part of darwin"s theory of natural selection. Top three not to have to have sex: inefficient, asexual is more efficient, costly, devoting energy to producing and maintaining sexual organs, finding and courting mates etc, risky for survival: stds, fights, injury. Numerous species are facultative asexual reproducers (asexual when conditions are good, sexual during times of stress) Seems very sensible, but relatively few species are obligate asexual reproducers, asexual species tend not to persist. This diversity of offspring provides challenges to competitors, predators, parasites. The tangle bank hypothesis (the value of males) The red queen hypothesis (why is sex so common) Different levels of investment for males and females (generalizations) Male reproductive success determined by # of matings. There is great variability in male mating success.
