4.7 Behavioral Genetics

4.7 Behavioral Genetics - March 7 2011 Biological Bases of...

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March 7, 2011 Biological Bases of Behavior: Part 1 Genetics, Hormones, Basics of the Nervous System Raelians: weirdos. Talk to aliens all the time. Like that’s their life. They admitted to having “done something” to a child. CLONED A CHILD. FWEIRDOS. Behavioral Genetics Genes: segments of DNA that guide the production of proteins to carry out specific tasks. Genotype vs. Phenotype Role of heredity: determining role of genetics vs. environment Family studies: Francis Galton noted intelligence ran in families. But also families provide environment. Twin Studies: correlation between MZ vs. DZ MZ>DZ: genetic MZ=DZ: common environment (something about the family environment) MZ<1: unique environment (the environments are different) Heritable ranges: -physical traits -schizophrenia/affective disorders -intelligence -temperament/shyness -social attitudes/religiosity/occupation type -happiness Adoption Studies: twins raised apart-GOLD STANDARD But, does it really prove genetic basis? Hot people are treated differently. Also, even highly heritable traits can be strongly influenced by the environment. (ex: corn heights depends on conditions) Also, genes can help “create” environment (temperament, physical attractiveness, choices makes people select for certain environments: shy people) Niches: environments and genetics working in concert to support a trait Other biological influences on behavior Testosterone! Endocrine system: releases hormones, sex-linked behavior, social behaviors; prenatal androgens
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4.7 Behavioral Genetics - March 7 2011 Biological Bases of...

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