PSY230H1 Lecture Notes - Lecture 6: Assortative Mating, Behavioural Genetics, Twin Study
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PSY230H1 Full Course Notes
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# of books in the home, parent s values, presence or absence of a tv. Features of the environment that are unique to the individual s experience. Heritability based on whether monozygotic (mz) twins are more similar to each other (concordance rate) than are dizygotic (dz) twins. Mz twins share 100% of genes in common (a single fertilized egg divides) Dz twins share 50% of genes in common (two separate eggs were fertilized) Equal environments: the environments experienced by mz twins are no more similar than those experienced by dz twins. If not, then you will overestimate heritability & underestimate shared environment. Assortative mating: there is no correlation between the mother of the twin s genes & the father of the twin s genes. If not, then you will underestimate heritability & overestimate shared environment. We can use this simple formula: h2 = 2(rmz rdz) Heritability of height from twin study = 2(. 93 - . 48) = . 90 (90%)
