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Evolution and path models in human behavioral genetics.

G Carey1

  • 1Department of Psychology, University of Colorado, Boulder 80309-0447.

Behavior Genetics
|September 1, 1991
PubMed
Summary
This summary is machine-generated.

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Pure vertical environmental transmission alone does not ensure full adaptation in human behavior genetics. Combining genetic and environmental transmission can lead to adaptive population means, yet empirical evidence for strong environmental transmission remains scarce.

Area of Science:

  • Human behavior genetics
  • Evolutionary biology
  • Quantitative genetics

Background:

  • The path-analysis model is commonly used in human behavior genetics.
  • Models of pure vertical environmental transmission may not achieve full adaptation under directional selection.

Purpose of the Study:

  • To examine the evolutionary implications of path-analysis models in human behavior genetics.
  • To investigate the adaptive potential of vertical environmental transmission in conjunction with genetic transmission.

Main Methods:

  • Analysis of path-analysis models in human behavior genetics.
  • Modeling evolutionary dynamics under directional selection with varying transmission coefficients.

Main Results:

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  • Pure vertical environmental transmission alone does not equilibrate population means at the selective optimum unless transmission coefficients are exactly 0.50.
  • Combined genetic and vertical environmental transmission allows population means to equilibrate at the selective optimum.
  • Vertical environmental transmission enhances population fitness and accelerates adaptation when genetic transmission is present.

    • Conclusions:

    • Vertical environmental transmission plays a crucial role in population adaptation when combined with genetic transmission.
    • A paradox exists between the significant fitness benefits of vertical environmental transmission and its typically small observed effect in empirical studies.