c-13 - 1. 50% for identical twins 2. 20% for fraternal...

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3/29/09 Contemporary Genetic Theories - Focus away from anatomical features - Toward patterns of correlations among blood relatives “Nature vs. Nurture” - How much is a product of shared genes (blood relatives)? - How much is a product of shared environmentalists? A. Twin Studies - Identical twins (MZ) = monozygotic (100% of genes) - Fraternal twins (DZ) = dizygotic (50% of genes) Twin studies serve as good controlled experience. - Twins share prenatal environment. - Share common environment (family, culture, social structure). Denmark study: - 3586 pairs born between 1881 – 1910 - Chance of finding a criminal twin when other twin was criminal
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Unformatted text preview: 1. 50% for identical twins 2. 20% for fraternal twins Problems: 1. Potential to overestimate genetic factor if twins are treated by environment as more alike than they really are. 2. Underestimates genetic factors if twins are treated more differently than they really are. 3. Difficult to control for other potential causes. B. Adoption Studies-Ideal setting for determining genetic input (in theory) *How much of behavior is natural (genetically from biological parent), and how much is from adopted parents?...
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This note was uploaded on 04/19/2011 for the course CJUS 200 taught by Professor Kipp during the Winter '09 term at Indiana.

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c-13 - 1. 50% for identical twins 2. 20% for fraternal...

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