PSYC 3201 Lecture Notes - Lecture 50: Genetic Correlation, Guppy, Pleiotropy

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The more extravaggent and fancy a male is the more likely he is to be chosen by the dull-colored females. Genetic correlation between male and females of the same species. Male genes that lead to trait are the same genes in females that leads to her trait attraction. Example: trinidad guppies females prefer orange males only orange males survive pleiotropy may cause new species to emerge. Example: dung beetles females prefer to mate with long-horned males. But costly because larger horns = smaller eyes. You"d expect to see some counterselection against these long horns. 3 alternative hypotheses for the evolution of female preferences. Runaway sexual selection: female is driving trait to become more and more elaborate so male trait exists at the same time as female preference. Sexual selection: male trait exists before female preference. Sensory exploitation: female preference evolves before the male trait even exists. Higher pitched calls come from small males while lower pitch comes from large males.

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