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Fertility and viability at the Sod locus in Drosophila melanogaster: non-additive and asymmetric selection

Published online by Cambridge University Press:  14 April 2009

Mirjana Milosevic ,
Andrés Moya  and
Francisco J. Ayala
Mirjana Milosevic
Affiliation:
Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92717, U.S.A. Institute of Zoology, Faculty of Science, University of Belgrade, Studentski Trg. 16, 11000 Beograd, Yugoslavia
Andrés Moya
Affiliation:
Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92717, U.S.A. Departmento de Genética, Facultad de Biologia, University of Valencia, 46100 Burjasot, Spain
Francisco J. Ayala*
Affiliation:
Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92717, U.S.A.
*
* Corresponding author.
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Experiments were designed to test in Drosophila melanogaster the effect of mating type at the Sod locus on fertility and viability. The experiments show that fertility is neither additive (or multiplicative) nor symmetric, i.e. that the fertility of a mating type cannot be predicted from the average fertility of the two genotypes involved in the mating. There is no significant male x female interaction with respect or progeny viability; but the interaction is significant for productivity, i.e. when fertility and viability are jointly taken into account. There is overdominance with respect to female fertility, but not with respect to male fertility or to viability. There also is alloprocoptic selection with respect to fertility and with respect to productivity, i.e. matings between like homozygotes are less fertile and productive than matings between dissimilar homozygotes. Selection at the Sod locus yields stable polymorphic equilibria, with the frequency of the F allele predicted at P = 0·641 or 0·695, respectively for low and high larval density.

Type
Research Article
Information
Genetics Research , Volume 57 , Issue 3 , June 1991 , pp. 267 - 272
Copyright
Copyright © Cambridge University Press 1991

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