PSYC 2740 Lecture Notes - Lecture 6: Heritability, Twin, Eugenics

• School: University of Guelph
• Department: Psychology
• Course: PSYC 2740
• Professor: Stephen Lewis

Document Summary

Diferences between people due to a certain cause (in percentages: environment, geneics. Heritability: amount of phenotypic variance in a group due to genotypic variance. Genotypic variance: individual diferences in people"s genes. Environmentality: amount of observed variance due to environment. Grandparents and grandchildren 25: closer relaives should have more personality similarity. 100% shared genes: dizygoic (dz) twins (fraternal) 50% shared genes: esimate heritability via similarity of mz vs dz twins, heritability formula. Environments for mz twins no diferent vs dz twins. Adopive children placed with parents similar to their birth parents. Twins raised apart: combines strength of twin + adopion studies. Where heredity = correlaion of the trait between the twins. Big 5: big 5 generally heritability of about 0. 50, meaning, environment also plays a role. Smoking and drinking: neuroicism, extraversion, sensaion seeking, moderate heritability for smoking and drinking habits. More hereditability for alcoholism (vs daily drinking habits) Psychological discomfort with one"s biological sex: gender idenity quite heritable (0. 62)