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Theory for the number of genes affecting quantitative characters

✍ Scribed by Y. C. Park

Publisher
Springer
Year
1977
Tongue
English
Weight
712 KB
Volume
50
Category
Article
ISSN
0040-5752

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✦ Synopsis

Bias in the estimation of gene number from a population of finite size will be reduced when the number of generations and the selection differential in the primary selection program are increased. A procedure to minimize bias due to dominance is proposed. Bias due to linkage disequilibrium is decreased by long generations of selection and small change of linkage disequilibrium. Bias due to inequality of gene effects was studied assuming that gene effects follow a half normal distribution. The epistatic bias arising from multiplicative gene effects disappears when the logarithms of the original measurements are considered even though the gene number estimate is unsatisfactory without transformation.

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A general expression for gene number estimation which encompasses the conventional formula was derived. It provides a basis for gene number estimation from the data of recurrent selection experiments that are not of sufficient duration to measure total response to selection.Gene number estimates are

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The number of sterile nodes of 81 families of nonfasciated recombinants derived from hybrids between fasciated and nonfasciated lines, are compared with those of 17 control groups consisting of homozygous plants only. As the homozygous lines and recombinants usually show the low variation of only +1