Biology 1002B Lecture 14: Bio 1001A Lecture 14
12 Mar 2016
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Document Summary
Offspring distinct from either parent and (usually) from each other. Binary fission (reproduction), bacteria exchange genetic material without reproducing (pseudosexual), obligatory asexual (extremely rare lineages and very new), Facultative sexual vs asexual (aspen trees get to choose) Sexual reproduction may involve diocey (separate sexes) or monoecy (hermaphrodites) Rose has male and female function in same individual) Monoecy can be sequential rather than simultaneous (clown fish = sequential hermaphrodites /change sex - start male -> change sex = prod antry) When and in what direction should an individual change sex (female fitness and male fitness increase as size increase, but females have more to gain by being big. Dioecious organisms also need to balance male and female function. Individual mothers in good condition/high rank may overproduce that sex, but population sex ratios are almost 1:1. First life forms and first eukaryotes reproduced asexually. Organized diploid sex (meiosis vs syngamy appeared -1. 5 bya)
