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A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis
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Forward and reverse response to artificial selection.

F W Nicholas1

  • 1Institute of Animal Genetics, Edinburgh, Scotland.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|January 14, 2014
PubMed
Summary
This summary is machine-generated.

Reverse selection can undo genetic gains from forward selection. The extent of reversal depends on the inbreeding coefficient and the duration of selection, with longer forward selection periods leading to diminishing returns.

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Area of Science:

  • Population Genetics
  • Quantitative Genetics
  • Animal Breeding

Background:

  • Artificial selection is widely used to improve traits in livestock and crops.
  • Understanding the long-term effects of selection, including potential reversals, is crucial for sustainable breeding programs.

Purpose of the Study:

  • To mathematically describe the impact of reverse selection on genetic gains achieved through prior forward selection.
  • To provide a framework for predicting the extent of genetic reversal under different selection scenarios.

Main Methods:

  • An additive genetic model was employed for a finite population of effective size N.
  • No natural selection was assumed.
  • Mathematical expressions were derived to quantify the change in metric mean due to reverse selection relative to forward selection.

Main Results:

  • The ratio of response to reverse selection (R) to the response to forward selection (Δx) was expressed in terms of the inbreeding coefficient (F).
  • When reverse selection duration equals forward selection duration (t'=t), R/Δx = 1 - F, where F = 1 - (1 - 1/2N)^t.
  • For a single generation of reverse selection (t'=1), NR1/Δx is approximately (1-F)/2F, and R/Δx never exceeds t'/t.

Conclusions:

  • Reverse selection can significantly reduce or eliminate genetic gains from previous forward selection.
  • The effectiveness of reverse selection is influenced by the inbreeding level and the duration of both forward and reverse selection phases.
  • These findings have implications for managing genetic resources and designing long-term breeding strategies to avoid unintended genetic erosion.