PSYCH 3JJ3 Lecture Notes - Lecture 8: Twin, Human Genome Project, Differential Susceptibility Hypothesis
11 Dec 2019
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Genetics and social development: methods of studying genetic contributions to development. Compare adopted children to biological parents (genetic connection) and adoptive parents (environmental connection) Compare similarities between identical twins (share 100% of genes) and fraternal twins (share 50% of genes) Monozygotic identical twins zygote splits in half and each half becomes a distinct embryo with exactly the same genes. Dizygotic fraternal twins two different eggs fertilized. If monozygotic twins show more resemblance than fraternal twins, then assumed that trait is largely due to genes. If resemblance is equal across two types of twins, the assumed that trait is largely influenced by environment. Shared environment a set of conditions or activities experienced by children raised in the same family. Nonshared environment a set of conditions or activities experienced by one child in a family but not shared with another child of the same family. Identical twins may have more shared environments than fraternal twins.
