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Dominance is not necessary for heterosis: a two-locus model

Published online by Cambridge University Press:  14 April 2009

Francis Minvielle
Francis Minvielle
Affiliation:
Department of Animal Science, Faculty of Agriculture, Kyoto University, Kyoto 606, Japan* Departement de Zootechnie, FSAA, Université Laval, Québec, P. Q., G1K 7P4, Canada†
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Summary

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Under a two-locus model with additive genes which combine multiplicatively to determine a quantitative trait, heterosis is generally observed in the F1 It is positive only if both frequencies of the best allele at each locus are not higher in the same parental population. In the F2, heterosis depends on the rate of recombination between the two loci. If linkage is tight, F1 superiority is nearly halved in the F2. But if the two genes are independent, heterosis is maintained in the F2 at the same level as in the F1.

Type
Research Article
Information
Genetics Research , Volume 49 , Issue 3 , June 1987 , pp. 245 - 247
Copyright
Copyright © Cambridge University Press 1987

References

Falconer, D. S. (1981). Introduction to Quantitative Genetics, 2nd ed., New York: Longman.Google Scholar
Pirchner, F. (1983). Population Genetics in Animal Breeding, 2nd ed., New York: Plenum Press.CrossRefGoogle Scholar
Sheridan, A. K. (1981). Crossbreeding and heterosis. Animal Breeding Abstracts 49, 131–144.Google Scholar