PSYC 2500 Lecture Notes - Twin Study, Heritability, Twin

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2. 2 heredity, environment and development: behavioural genetics. Devoted to uncovering the heredity and environmental origins of individual differences in human traits and behaviours. Very complicated: most characteristics are not determined by one single gene, most characteristics are not binary or tertiary, there is a continuum (cid:190) many behavioural phenotypes reflect polygenic inheritance (as opposed to sgh) Difficult to trace effects of each gene involved. Aa, bb, cc, etc: total number of dominant alleles ranges from 0 to 8 (9 degrees of extroversion, there are 81 genotypes. Most common is 4 dominant, 4 recessive (cid:190) we can see from this example how many genes work together to create a range. Twin studies vs. adoption studies: twin studies (cid:190) monozygotic (identical twins) Dizygotic (2 eggs fertilized individually) (cid:190) what do they find: disorders sch as depression show evidenced of heritability. In monozygotic twins, there"s a 50% chance the other has the same.

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