Behavior Genetics Dr. Blakemore PSY 235.

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Presentation transcript:

Behavior Genetics Dr. Blakemore PSY 235

Polygenic Transmission Many traits can vary along some dimension These kinds of traits are influenced by many (perhaps hundreds or thousands) of genes working together Many behaviors are influenced polygenetically

Behavior Genetics Major methods are twin studies and adoption studies. One common technique of the behavior geneticists is to examine the correlation between pairs of people of differing degrees of genetic relatedness.

Intelligence The characteristic most studied by behavior geneticists is intelligence. There is evidence for both genetic and environmental influences on intelligence.

Intelligence - Correlations Random Pairs Pairs of unrelated strangers - .00 Biological Relatives Living Together Parents and their biological children - .42 Siblings - .47 Fraternal Twins - .60 Identical Twins - .86

Intelligence - Correlations cont’d Living Together - Not Biologically Related Adoptive parents - adopted children .19 Adopted siblings - .32 Biologically Related - Living Apart Biological parents - adopted-away children .22 Identical twins reared apart - .72

Intelligence - All Correlations Identical Twins - .86 Identical twins reared apart - .72 Fraternal Twins - .60 Siblings - .47 Parents and their biological children - .42 Adopted siblings - .32 Biological parents - adopted-away children .22 Adoptive parents - adopted children .19

Personality Several personality characteristics show genetic influence E A S traits - temperament E= Emotionality, A= Activity, S= Sociability Specific fears, sensation-seeking, physical anxiety, anger, task persistence, and fidgeting