Psychology 2040A/B Lecture 2: Lecture 2 .pdf
5 Apr 2015
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Gene-cs important for growth and development. Precise sequence of base pairs comprising a gene can vary considerably between individuals. Twin b r = . 85. Twin b r = . 62. Total variability = genes (a2) + shared environment (c2) + unshared environment (e2) Concordance mz = genes (a2) + shared environment (c2) Concordance dz = 0. 5 * genes (a2) + shared environment (c2) No, for some traits like intelligence, h- es-mates are smaller for children than adults! Heritability and development: evidence of gene- environment interac-on. Genes and experience contribute to di erences in intelligence. Genes also in uence the kinds of experiences we have. Heritability = a2 / a2 + c2 + e2. This is all just numbers. The same gene has opposite e ects on cogni-on at di erent ages. Quan:ta:ve gene:cs: the study of heritability. Molecular gene:cs: the study of individual genes. In both elds, development is an important constraint. Epigene-cs: how experience is wriyen onto the genes.
