BIOB50H3 Chapter Notes - Chapter 7: Live Fast, Die Young (Film), Parental Investment, Pinus Ponderosa
Document Summary
Record of events relating to an organism"s growth, reproduction & survival. Overall pattern of timing & nature of life history events averaged across all individuals in the species (7. 3) Shaped by division of energy & resources between growth, reproduction and survival. Natural selection determines the effects of these strategies, not the individual"s choice. Phenotypic plasticity may produce a continuous range of growth rates or discrete types (morphs with no intermediate forms: example: spadefoot toad tadpoles contain two morphs. Omnivore morphs feed on detritus & algae, Carnivore morphs feed on fairy sheep, bigger mouths, stronger jaw muscles, accelerated growth. Omnivores can turn into carnivores if they switch their diet to fairy shrimps. Proportion of omnivores: carnivores depends on food supply: can be a physiological or an adaptive response. Mode of reproduction is a basic life history trait. Occurs in all prokaryotes & many protists. Pros: recombination leads to genetic variation increase capacity of pop to evolve in response to environmental challenges.
