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Lecture 19- April 14

Lecture 19- April 14 - may not change in absolute amount...

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Lecture 19 PSY 257 April 14, 2009 Behavioral Genetics and Evolutionary Theory Behavioral Genetics - deals with degree to which psychological characteristics are inherited genetically or are the result of the environment - Two different kinds of research studies done: o Twin studies: comparing the similarities of members of twin pairs MZ twins vs DZ twins: so if MZ are 100% similar in their genetics, then there can be evidence for high heritability Raised together versus raised apart o Adoption Studies: comparing the similarities of children to their adoptive and biological parents - The heritability coeffecient (h squared) o H squared = variance in trait accounted for by genetic factors divided by total variance in trait o H squared is population and measurement specific: genetic component
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Unformatted text preview: may not change in absolute amount, but if environmental factors decreased, genetic component becomes more important by default o You can do this for one trait on a time o Some traits have higher heritability coefficients than others Intelligence is high Average heritability of personality traits around .4 (40%) Have to be careful how we interpret this-Shared vs non-shared environment o 3 kinds of gene-environment interactions Reactive: same factor affects different people differently because of genetic difference Evocative: genetic makeup causes you to evoke reactions form your environment Selective: genetic makeup causes you to select certain environments Evolutionary Theory-...
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