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Genetics and Society

Genetics and Society. Everything’s Heritable. First Law. All human behavioral traits are heritable Second Law. The effect of being raised in the same family is smaller than the effect of genes

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Genetics and Society

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  1. Genetics and Society

  2. Everything’s Heritable • First Law. All human behavioral traits are heritable • Second Law. The effect of being raised in the same family is smaller than the effect of genes • Third Law. A substantial portion of the variation in complex human behavioral traits is not accounted for by the (additive) effects of genes or families.

  3. Genetic Architecture • Fourth Law: Genetic variants that are common in a population have very small individual effects on behavioral traits • Not always like this in other species • Can be different in subpopulations • Strong selection can change architecture

  4. The twin studies are all right • According to GCAT

  5. Selection • Every society selects for something • Usually unintended

  6. Breeder’s Equation • R = h2S • R = response • h2 = narrow-sense heritability • S = selection differential

  7. Selection can be fast or slow • Interesting changes can happen in less than 1000 years • Maximum time available for human differentiation, ~100,000 years

  8. Dan Freedman’s babies • Behavioral differences at birth

  9. Populations, Classes, Jobs • Selection changes populations • Classes change by selection and differential recruitment • Jobs, differential recruitment

  10. Distributions • Modest differences in the mean imply big differences at the extremes

  11. Genetic Isolation • Geographic Separation • Endogamy

  12. Epigenetic Inheritance • Trendy • Rare • Hard to imagine adaptive mechanism • fuhgeddaboudit

  13. Human Capital Formation • Usual Model: Parents invest in human capital • Fewer kids is better • Not true for genetic contribution

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