BIOL 313 Lecture Notes - Lecture 9: Secondary Sex Characteristic, Mate Choice, Gamete
3 Feb 2018
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Darwin termed and described the evolutionary process of sexual selection. (cid:1688) selection that depends on the advantages which certain individuals have over others of the same sex and species in the respect of reproduction(cid:1689) Deals with characteristics or behaviours that increase your ability to reproduce. Gamete production (fecundity) number of gametes produced. Mating ability (gamete exchange) time required to find individual of opposite sex and mate with them. Darwin viewed natural selection as operating via phenotypic differences in survival and gamete production. Introduced sexual selection for phenotypic section based on differences in mating and fertilizing ability. Sexual selection is used to explain the existence of secondary sexual characteristics and sexual dimorphism. Secondary sexual characteristics1: characteristics of males and females not directly involved in the process of reproduction. Examples: horns, plummage, manes (females don"t have ssc males do) It is particularly important under 2 conditions: Intrasexual selection when individuals of one sex compete among themselves for mates.
