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The effect of repeated cycles of selection on genetic variance, heritability, and response

โœ Scribed by L. Gomez-Raya; E. B. Burnside

Publisher
Springer
Year
1990
Tongue
English
Weight
493 KB
Volume
79
Category
Article
ISSN
0040-5752

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โœฆ Synopsis

The genetic variance of a quantitative trait decreases under directional selection due to generation of linkage disequilibrium. After a few cycles of selection on individual phenotype, a limit is reached where there is no further reduction in the genetic variance. Bulmer's model is extended to an animal breeding situation where selection is on information on relatives rather than on the individual's own performance. Algebraic expressions are derived to predict the decrease in genetic variance and associated reductions in heritability and response in the limit. Consequences of the results are discussed in the context of breeding strategies.

๐Ÿ“œ SIMILAR VOLUMES

Effect of mass selection on the within-f
Effect of mass selection on the within-family genetic variance in finite populations
โœ E. Verrier; J. J. Colleau; J. L. Foulley ๐Ÿ“‚ Article ๐Ÿ“… 1989 ๐Ÿ› Springer ๐ŸŒ English โš– 674 KB

The adequacy of an expression for the withinfamily genetic variance under pure random drift in an additive infinitesimal model was tested via simulation in populations undergoing mass selection. Two hundred or one thousand unlinked loci with two alleles at initial frequencies of 1/2 were considered.

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The effect of directional and heterotic selection on the standardized variance of gene frequency (f=ฯƒ q (2) /ยฏq(1-ยฏq)) has been examined. It has been found that heterotic selection always results in f values lower than those expected due to drift alone. Additive directional selection can result in l