BIO318Y5 Lecture Notes - Lecture 12: Estrous Cycle, Common Slipper Shell, Dominating Decision Rule
Document Summary
Damselfly: a battle for paternity: sperm competition. Last lecture: rapid senescence in male marsupial mice: not group selection (brief review of levels of selection) but further support for antagonistic pleiotropy model of aging , sexual conflict. Intraspecies conflict over mating rates in females: secondary sexual characters in males can thus evolve via 1) female choice, 2) male-male competition, 3) sexually antagonistic coevolution. Evolutionary fitness: define, survival of the fittest (herbert spencer); picked up by darwin in his 5th edition of. Genghis khan fertilized a lot of women, perhaps related: behavioural: survival success and mating success. Episodes of sexual selection that darwin overlooked: cryptic female choice and sperm battles. Stiletto fly spermathecae: spermathecal sac and has different pouches for different sperms from different males; the females can use certain muscles to control which sperm from which pouch will fertilize her eggs. Dominant males can"t keep up with necessary sperm production because they were mounting a lot in the beginning.
