BIO220H1 Lecture : BIO220-Lecture 02 - The Evolution of Sexual Differences.pdf
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BIO220H1 Full Course Notes
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Document Summary
Sexual differences (dimorphisms: the puzzle of conspicuous ornaments, darwin"s answer (hypothesis, origin of sexual differences, male-male competition. Sexual selection (cid:4) depends on the advantage which certain individuals have over other individuals of the same sex and species, in exclusive relation to reproduction. (cid:5)(cid:1) charles darwin. Sexually selected traits function to enhance mating success. It is a subset of natural selection but it can be useful to consider them separately. Robert trivers (1972): sexes differ in their reproductive investment, members of the sex that invest little in offspring will compete among themselves to mate with members of the sex that invest more in offspring. Males: tiny, mobile gametes (sperm, fitness limited by access to fertilizable gametes. Females: large, resource-rich gametes (egg, fitness limited by access to resources. 16 g n i r p s f f o f o r e b m u.
