Sexual selection is a mode of natural selection where members of one biological sex choose mates of the other sex to mate with intersexual selection...
Natural Selection - Crash Course Biology #14
Allows for the competition between sperm for fertilization of the female's egg. Sign In or Create an Account. Garter snakes overwinter in communal dens. So, one assumption must be violated it is more likely that the assumption about fitness will be violated.
Here, we can explain the evolution of female behavior without considering genetic indirect benefits. Nevertheless, this hypothetical scenario provides a useful benchmark because it favors traits that remove sexual conflict and is experimentally tractable see the review by Edward et al.
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In Darwin's and Fisher's theory of sexual selection, females prefer ornamented males; the evolution of larger ornaments is limited by increased mortality, lor example through predation. An adornment of given mass should often raise mortality more in low than in altitudinous quality phenotypes. Possible consequences over the extent of the evolution and optimal greatness of ornaments are here examined with mathematical models.
Fisher suggested that an ormamem may evolve if it initially improves virile survival. Female preference then spreads for adorned males. Their consequent mating advantage furthers propagation of the preferred trail. Choosing adorned males, females might therefore touch on offspring with high general survivorship, but sons also inherit the handicapping ornament.
When it reduces survival more in low than in high quality phenotypes, the handicap mechanism in conjunction with the Fisherian mating advantage becomes powerful with lower heritability of fitness than previously supposed. It still requires that fitness has some heritability, for which there is indirect evidence, but division measurements are lacking. In Darwin's and Fisher's theory, both mating advantage and mortality disadvantage enhancement with ornament size, and consider at its optimal development.
If a given adornment reduces survival most in low quality phenotypes, the optimum increases with phenotypic quality.
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Evolutionary conflicts of interest arise whenever genetically different individuals interact and their routes to fitness maximization differ.
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