BIOL 1003 Lecture Notes - Lecture 15: Inclusive Fitness, Bisexuality, Mutation Rate
Document Summary
Ultimate cause: hypotheses for the evolution of homosexuality: To be adaptive, must also be at least partially heritable. Homosexuality occurrence far exceeds the (cid:498)baseline mutation rate(cid:499) of any. Parent manipulation parents control reproductive choice. Alliance formation same-sex alliances aid survival. Polygamy more than one male or more than one female: polygyny one male, two or more females. Scramble competition winner males mate more. Lek males gather & display, females choose best display: polyandry one female, two or more males. Winning male mates with majority of females in. Galapagos hawks - 1 female to 5 males, few offspring survive. Acorn woodpecker - up to 3 females (often siblings), up to 7 males (often siblings) in one nest. Ultimate cause increased probability of mating. Polygynandry two or more males with two or more females. Monogamy one male, one female/exclusive: impossible for males to monopolize females. Females receptive for short period of time: male care needed for offspring.
