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Lecture 4

Week 4 Modules 11 12

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Louisiana State University
PSYC 2000

Module 11 Behavior Genetics and Evolutionary PsychologyBehavior Genetics Predicting Individual DifferencesBehavior Geneticists scientist who study our differences and weigh the relative effects of heredity and environment Genes biochemical units of heredity that make up the chromosomesEnvironment every non genetic influence from prenatal nutrition to the people and things around usGenes Our Codes for LifeGene our code for life segment of DNA containing the code for a particular protein determines our individual biological development Chromosome threadlike structure made largely of DNA moleculeDNA a spiraling complex molecule containing genes oSegments of DNA consist of genes that make proteins to determine our development GenomeComplete instructions for making an organismoComplex traits a combination of genesoHumans and animalsTwin and Adoption StudiesAllow us to controloHeredity while varying the home environmentoHome environment while varying heredityTypes of studiesoIdentical vs fraternal twinsoSeparated twinsoComparing adoptive vs biological relativesIdentical vs Fraternal TwinsIdentical twins develop from a single fertilized egg creating two genetically identical organismssame sex alwaysFraternal twins develop from separate fertilized eggs genetically no closer than other siblings either orWhich are more similaroPersonality identical twins are those similar than fraternal on extraversion and neuroticism oDivorceidentical twins whos divorced odds go up 55 timesFraternal twin whos divorce odds go up 16 timesoBUT twins are often TREATED alikeSeparated TwinsStriking similarities in personalities attitudes abilities interests and fearsCriticismsoAppearance affects treatmentoAdopted twins place in similar environmentsoStrangers have similarities too
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