Module 5,6 1-19-10 - Introductory Psychology TA: Jennifer...

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Introductory Psychology TA: Jennifer January 19, 2010 Module 5: Behavior Genetics and Evolutionary Psychology 1. Behavior Genetics: Predicting Individual Differences 1. Behavior geneticists study our differences and weight the relative effects of heredity and environment 2. Genes: Our Codes for Life – a segment of DNA containing the code for a particular protein; determines our individual biological development 1. Located on DNA (Deoxyribonucleic acid) which are located on chromosomes, which are located in nuclei in cells 2. Humans have 46 chromosomes (23 from mom, 23 from dad) 3. About 30,000 genes comprise the human genome 4. Heritable vs. Shared Environmental Effects 1. Genotype – genetic makeup, can be affected by the environment 1. Made up of heritable and environmental effects (radiation/chemicals can effect your genes) 2. Genes can predispose you to certain disorders 2. Phenotype – physical characteristics 1. Genotype influences you, but also environmental 3. Endophenotype – psychiatric biomarker 1. Incorporates both Genotype and Phenotype to link to a certain disorder 2. i.e. phenotype of suicide, genotype of aggression – Endophenotype links them together 5. Gene Environment Correlation 1. Passive rGE – genetic factors common both to parent and child that can affect parenting behaviors, i.e. intelligent parents purchase and read more books to their children than unintelligent parents do 2. Active rGE – a child’s heritable vulnerabilities can affect selection to his or her environment 3. Evocative rGE – genetically influenced behaviors illicit reactions from others, i.e. impulsive children can reinforce bad parenting 6. Twin and Adoption Studies 1. Monozygotic twins – identical, dizygotic – fraternal 2. You can see which disorders have genetic components and observe shared and non-shared environmental effects using identical twins 3. Separated Twins 1. A number of studies compared identical twins reared separately from
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Module 5,6 1-19-10 - Introductory Psychology TA: Jennifer...

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