PSYC3016 Lecture Notes - Lecture 3: Assortative Mating, Twin, Zygosity
Document Summary
They share a different amount of genetic information: twin studies provide us with. 50% of genetic information shared: you need to grapple with two important statistical constructs to understand the basic logic of twin studies. Mz twins: the tighter, the more stronger correlation, there is a linear relationship- the height one on increases, the other increases, variation is how the points are distributed over the estimates. Dz twins: they have a weaker correlation, fit normal distribution better, dz: more variation. Wrong with this assumption: effects can be dominant, recessive, heterozygous, gene-gene interactions, gene- environment interactions. Phenotype (p)= additive genetics effects (a) + common environment (c) + unique environment (e) Meta analysis of studies of genetic influences on child psychopathology: internalising and externalising psychopathology prior to adult hood: shared environment, upbringing, parenting, ses, adhp: shared environment, most related to genetic influences, around 20% due to unique environment.
