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Mate Preferences and Selection

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Bishop's University
PBI 141
Dr.Andrea Drumheller

Evolutionary Psychology VIntroduction to mate selection strategiesDifferential reproduction is what drives evolutionI Reproductive StrategiesA Asexual1benefitsiLow costiiNo energy in finding and retaining a mateiiiOrganisms that divide are genetically identical 2 costsLack of variation but evolution relies on variationCant adapt Any environmental change can wipe out a whole species B Sexual 1costsiOnly half of our genes are passed oniiTakes energy to find and retain a mate in order to pass your genes down2 benefitsGenetic diversitywe can adapt to a changing environment Less direct competition because of variation allows us to take advantage of multiple environments C Parasites as impetus to evolve sexual reproductive strategiesoThe first organisms to reproduce sexually but they needed a host with a long life spanoMitochondria probably played a roleII Sexual selectionA Darwins Insight1 Many physical characteristics of animals are NOT adaptations to the environment2 Many physical characteristics are clearly Maladaptive3 Darwins insightadaptations occur to guarantee REPRODUCTIONnot survivalB Two broad categories of sexual selection1 Malemale intrasexual competition for access to femalesPromotes evolution of traits help males outcompete other males for access to females2 Female Mate Choicea Females as limited resources Trivers1 higher levels of parental investment by females makes females a limited resource over which males must competebhuman ancestorsaA long time and a lot of energy was invested due to gestation lactation and provisioning of offspring2We are limited resources because women can only bear a child every 9months while lactating its hard to get pregnant and most women dont want more than two childrenselection driven by mate choice operates most strongly in the highinvesting parent
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