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A new model for measuring breeding genetic distance. II. Polygenic traits
Annals of Human Genetics
|May 1, 1978
Summary
This study extends the breeding genetic distance measure to polygenic traits, defining a new metric to quantify genetic differences between populations. The research provides calculation methods and applies the measure to human skin color, offering insights into genetic inertia.
Area of Science:
- Quantitative Genetics
- Population Genetics
- Human Genetics
Background:
- The breeding genetic distance measure, initially for single loci, requires extension for complex polygenic traits.
- Understanding genetic differentiation between populations is crucial for evolutionary and applied studies.
Purpose of the Study:
- To extend the Carlson & Welch (1977) single-locus breeding genetic distance to polygenic traits.
- To define and provide methods for calculating a new genetic distance measure, theta(-x, approximately x).
Main Methods:
- Definition of theta(-x, approximately x) as the largest subpopulation mean selectable from a parent population.
- Calculation of theta(-x, approximately x) using truncation selection formulas and tables for two, three, and four loci.
- Utilizing a normal approximation for theta(-x, approximately x) values.
Main Results:
- Formulas and tables for calculating the extended genetic distance are provided.
- Normal approximation for theta(-x, approximately x) is shown to be adequate for practical applications.
- The measure was applied to human skin color data and the concept of genetic inertia.
Conclusions:
- The extended breeding genetic distance measure offers a robust method for quantifying genetic differentiation in polygenic traits.
- The findings have implications for understanding human population structure and evolutionary processes like genetic inertia.