Psychology 3221F/G Lecture Notes - Lecture 7: Stag Beetle, Sequential Hermaphroditism, Parthenogenesis
12 Mar 2017
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Q: what is point sex, and why m and f?- can have sex w/o gender. The evolution of sex: defining feat sex syngamy: fusion cells dif individs produce offspring, sex consists meiosis- cell division reduces genetic material in cells half- followed fusion cells from dif individs- cells v dif, ansigomy- v dif cells. Meiosis: produce variation among gametes- process one individual and create new novel chromosomes- swapped some info and results haploid daughter cells- fuse another individ and new. The parker model of the evolution of m and f: Isogamy unstable: selective adv reducing investment each gamete. Producing many small gametes (carrying only dna) may lead greater reprod succ (sperm: selective adv increasing investment each gamete. Prod fewer, larger, nutrient-rich gametes may lead greater reprod succ (egg: these dif gamete strategies lead eventually difs phenotype and behav- result m and f phenomenon.
