Genetics and society
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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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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

  • 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.


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


The twin studies are all right

  • According to GCAT


Selection

  • Every society selects for something

  • Usually unintended


Breeder’s Equation

  • R = h2S

  • R = response

  • h2 = narrow-sense heritability

  • S = selection differential


Selection can be fast or slow

  • Interesting changes can happen in less than 1000 years

  • Maximum time available for human differentiation, ~100,000 years


Dan Freedman’s babies

  • Behavioral differences at birth


Populations, Classes, Jobs

  • Selection changes populations

  • Classes change by selection and differential recruitment

  • Jobs, differential recruitment


Distributions

  • Modest differences in the mean imply big differences at the extremes


Genetic Isolation

  • Geographic Separation

  • Endogamy


Epigenetic Inheritance

  • Trendy

  • Rare

  • Hard to imagine adaptive mechanism

  • fuhgeddaboudit


Human Capital Formation

  • Usual Model: Parents invest in human capital

  • Fewer kids is better

  • Not true for genetic contribution


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