James_Lecture_7_Nature_vs[1]._Nurture_pt_2___student_version

James_Lecture_7_Nature_vs[1]._Nurture_pt_2___student_version...

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Nature and Nurture pt. 2 I. Untangling genetic & environmental contributions II. Nature/Nurture and Gender
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Untangling Genes & Environment Behavioral Genetics 1. Twin studies 2. Adoption Studies
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Twin Adoption Difference in genetic relatedness, Same environment Identical twins together Fraternal twins together Biologically unrelated, Same environment Adoptive parents Adopted children Biological children of adoptive parents Type of Study Objective Key Comparison Contribution of genes Contribution of environment
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Twin Studies Identical vs. fraternal twins Identical twins - Single egg - Share 100% of genes Fraternal twins - Separate eggs - Share 50% of genes 100% 50%
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Twin Studies The Big Question: Since identical twins share 100% of their genes, are they more similar to each other than fraternal twins? What does the research say?
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Examples
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Twin studies So what does all this mean? Identical twins do seem to be more similar than fraternal twins in many ways but it’s still hard to untangle the genetic and environmental factors… Are the differences between identical and fraternal twins solely attributable to genes?
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