BIO 3122 Lecture Notes - Lecture 19: Sexual Conflict, Wrasse, Pollination
23 Jan 2018
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Sex role reversals offer insights into how sexual selection operates. In wattled jacanas, males have the mate choice (typically, females have limiting resource and she gets to choose: role reversals help us understand natural selection favoring these patterns. Sex role reversal in pipefish: male has brooding pouch and carries the fertilized eggs, he has a sure paternity here bc he houses the egg and fertilizes it, normally maternity is assured. Females benefit by having more daughters (sper(cid:373) is (cid:374)ot li(cid:373)iti(cid:374)g a(cid:374)d so does(cid:374)(cid:859)t (cid:374)eed (cid:373)a(cid:374)(cid:455) (cid:373)ales to get ulti(cid:373)ate fitness of group which is more fertilized sisters of her brood. : parental sex determination. Trivers-willard hypothesis: mothers alter sex ratio depending on condition, produce females in poor condition, produce males in good condition; males likely to benefit more from being large. Flowers modify floral sex ratios in an adaptive manner as well - pattern known as darwin"s syndrome: In species that produce flowers in a racine (ex.
