PSYC 2450 Lecture Notes - Lecture 3: Twin, Selective Breeding, Heritability
23 Jan 2017
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Document Summary
Genotype (inherited genes) is expressed through phenotype (observable characteristics and behaviors) The influence of environment is also acknowledged: example: diet may affect height. Heritability: amount of variability in a trait that is attributed to hereditary influence. Methods to determine heritability: selective breeding experiments (animals) Tryon"s (cid:498)maze bright(cid:499) and (cid:498)maze dull(cid:499) rats. Compare members of family who live together: family studies. Are identical twins reared together more similar than fraternal twins reared together: adoption design. Are adopted children similar to biological parents or adopted. Concordance rates are calculated parents: percentage of pairs of people in which both members display a trait. Correlation coefficient may be calculated: correlation between two people being compared regarding how similar they are. Once you have the correlation coefficient (r) then can calculate . H = (r identical twins r fraternal twins) * 2 use values from. H = (. 86 - . 60)*2 = . 52. Therefore, a moderate contribution of hereditary to iq table.
