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Genetic Laws & Human Behavior: Insights on Heritability & Society

Explore the laws of genetics shaping human behavior, from heritability to selection. Discover how genetics influence society and the formation of human capital.

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Genetic Laws & Human Behavior: Insights on Heritability & Society

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Presentation Transcript

  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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