BIOLOGY 1M03 Lecture Notes - Lecture 8: Isogamy, Sexual Selection, Anisogamy
6 May 2019
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Document Summary
Why have sex: how can sexual species exist despite the "twofold cost of sex" Favours individuals with heritable traits that enhance their ability to obtain mates. Sexual dimorphism refers to any trait that differs between males and females of the same species: e. g. Sexual conflict refers to features that are advantageous in one sex but deleterious in another: situations where genes for example have a different fitness effect on the different sexes. Sexual selection violates the assumptions of the hardy-weinberg principle by causing certain alleles to increase or decrease frequency and resulting in evolutionary change. Female choice: females choose mates on the basis of, physical characteristics that signal male genetic quality (honest advertising, resource or parental care provided by males (bribing, nuptial gift, e. g. Sexual cannibalism, female preying mantises eat males after mating for nutritional benefits or as a mechanism of rejection.
