BGYB51H3 Lecture 22 Notes Nov 24

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University of Toronto Scarborough
Biological Sciences
Maydianne Andrade

BGYB51H3 Lecture 22-23 Notes -o]Z]Zš}ŒÇ]ZšZ‰ššŒL]L2}Œ‰Œ}µ š]ÀL2]L2ÀLšZÁ]šZ]L}L[Zo]š]K -life history theory explains variation N sexual maturity N offspring size N number of offspring N number of reproductive bouts N longevity -perfect organism produces large high quality offspring, matures early and lives forever -life history theory explains that there are trade offs in organisms due to biological processes taking some time, finite energy, and limited resources -natural selection favours balance of allocation to maximize reproductive success and resources through balancing time and energy -variation in life histories comes from variation in resource allocation strategies used by organisms -increased size at sexual maturity can lead to increased reproductive output with the cost of possibly being killed by predators as well as decreased repair -mutations that cause later maturity can be beneficial except in high predation areas -early sexual maturity under intense predation pressure is more beneficial than later maturity -extrinsic factors can affect the reproductive success of organis
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