CGS NS 201 Lecture Notes - Lecture 6: European Tree Frog, Female Promiscuity, Stellar Population
9 Aug 2018
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Document Summary
Types of selection, stablizing, the extremes are selected against, different selectors at lower and higher end, produces over subsequent generations a population with less variation, reflected a tighter bell-shaped curve. Individuals with intermediate features are selected against: produces after many generations a divided population, each with their own bell-shaped distribution, temporarily or spacially separate environments, sexual selection, intrasexual selection, sperm competition is a form of post-mating competition. Males can give larger ejaculates when there"s competition for females (triggered by smell of nearby competitor) Can be modulated depending on male"s assessment of female promiscuity. Multiple kinds of sperm: sprinters, blockers, killers. Sperm plugs: intersexual selection, combat is considered a pre-mating competition, resulting in evolution of male features (secondary sex characters) for fighting. Male features that are related to combat. Huge tusks, antlers, etc. good for fighting: males that are larger than the ideal size tend not to survive long but father many children, sexy son hypothesis.
