AS AM 100FF Lecture Notes - Lecture 2: Twin Study, Menarche, Longitudinal Study
15 Nov 2017
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Heritability= variation of genotype/ (variation of genotype+ variation of environment) So in nature, heritability is lower than that in lab because of the more variation of the growing environment. Meta-analysis of the heritability of human traits based on fifty years of twin studies. Half of our traits are affected gene and half are affected by everything else. Heritability of age at menarche in girls from the fels longitudinal study. Confounding might lead to severe bias in the estimate of heritability. Confound: having 2 variables that are completely identical. Mz twin might be more similar than dz not only because of genetic but also environment (how their parents dress them similarly) So using distinct relatives might be better for the measure of heritability because they have different environment. Ga- 180 cm on average ga- 182cm on average. Aa- 178 cm on average aa- 178 cm on average.
