BIOL 369 Study Guide - Quiz Guide: Sperm Competition, Membrane Potential, Allosome
4 Dec 2016
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2 factors give gender differences: offspring energy/care requirements (ex. Egg size increase for multicellular life: mating system (ex. sex frequency, fertilization probability, sperm competition, etc. ) Mammal: adhesion to egg, acrosome reaction, contact with egg membrane, fusion with membrane, destruction of sperm receptors. Males can be adapted to high sperm density or it can suffer from polyspermy. Which is v bad: s. purpurate adapted, s. franciscanus not adapted. Sexual selection: intrasexual selection male combat, intersexual selection based on male charm, female passivity and male competition have gotten most research. Choosier: female energy only limiting resource. Trivers said bateman"s principles were because of who invests more energy in reproduction not just innate differences: reversal in pattern when males invest more, sex that invests more is limiting resource choosier. Paternity: investment in offspring only furthers darwnian fitness if baby is yours, interspecific having others raise the young, intraspecific having the mate be stolen. Sex with greater parental role that shows mate selection.
