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evol. psy 307Slide2

Evolution by Natural Selection

evolution emerged to explain three fundamental observations wide variety of species, species characteristics suited to achieve distinct functions and share many structural and functional characteristics
principles of population produce more offspring than the ecosystem can support which results in a struggle for existence
3 key elements of Darwin’s theory variation, inheritance, selection
“differential reproductive success” (DRS) organisms best adapted to an environment will be most likely to survive to reproductive age and have offspring of their own
sexual selection emphasized adaptations that promoted survival adaptations and therefore DRS
trait positively impacts reproductive success could be selected for even if it jeopardizes survival
Intrasexual selection traits that facilitate competition between members of the same sex for access to mates
traits that promote being selected as a mate by the opposite sex increase DRS
Darwin’s theory accomplished explained how species and diversity could arise, diversity of species, why attributes appear to have a purpose, united all organisms into a common ancestral tree
evolution species change over time
differences of whale and shark horizontal (turn up) vs vertical (forward) tail
Prospective memory remembering to perform a planned action or recall a planned intention in the future
some traits hamper survival implies survival only matters if it impacts reproduction
intrasexual selection traits that facilitate competition with rivals for mates
intersexual selection traits that promote being selected as a mate by opposite sex
objections to evolution emotional, religious, rational
emotional objections suppresses rationality, aids in tribal rivalries
religious objections contradicts religious doctrines unless accounts taken as alegories
rational objections How and why are traits inherited (partially explained by genetics), historical study not scientific (peppered moth, antibiotic resistance)
passive process can't develop complex organism matter self organized and propagated: improved step by step in additive process
Created by: james22222222
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