Sex Differences. Biological Sex. Recombination of genes Sexual reproduction involves multiple individuals Usually 2 Male vs Female What determines male and female?. In ye old days…. Aristotle Sex of infant determined by how much heat was in a man’s sperm.
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What determines male and female?
Edmund Beecher Wilson & Nettie Stevens 1905
chromosomal XY sex-determination system
Mated fruit fly’s in monogamous & promiscuous groups
Male reproductive success increases with number of mates
Female reproductive success does not increase with multiple mates
“The female, with the rarest exceptions, is less eager than the male…she is coy, and may often be seen endeavoring for a long time to escape.”