BIO120H1 Lecture Notes - Lecture 6: Eichhornia Crassipes, Asexuality, Meiosis
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BIO120H1 Full Course Notes
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4:10 pm see slides p4 for reproductive modes reproductive system: sexual > dioecious (us) two sexes. > self fertilization darwin on sex evolution of separate sexes, meiosis began when reproduction became sexual. Both asexual and sexual reproduction e. g. water fleas: sexual reproduction in warmer, turbulent waters. asexual reproduction in cooler, calm water. Costs of sex: time and energy to find and attract mates time and energy to find and attract mates increased energetic costs risk of predation and infection cost of producing males. 50% less genetic transmission > can results in less fit offspring break up of adaptive genes combinations paradox of sex. Favourable combination of mutations brought together more rapidly by sex see slides p13 recombination sex we get to abc much faster that asexual. abc is the fittest genotype. sex allows weaker mutations to die off faster creating stronger pop.
