PSYB30H3 Lecture Notes - Twin Study, Heritability, Machiavellianism
Document Summary
Codominance and incomplete dominance: neither dominant, or one dominant - doesn"t hide effects of other. Example: religious upbringing reduces influence of genetic factors on disinhibition. Differential exposure of individuals with different genotypes to different environments. Passive: parents provide both genes and environment to children. Child"s verbal ability and the number of books in home. Reactive / evocative: parents (or others) respond to children depending on the genotype. Baby"s liking for cuddling and mother"s cuddling behavior. Active: person with particular genotype seeks out environment. High sensation seekers expose themselves to risky environments. Attempt to determine % of individual differences in a trait due to genetic and % due to environment. Determine the ways genes and environment interact and correlate. Heritability: amount of individual difference in trait due to genetic differences. Environmentality: extent to which individual differences are due to environmental differences. Environmental variations increase - heritability will be lower. Even highly heritable traits modifiable by environment.
