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Homeostasis, enzymatic heterozygosity and inbreeding depression in natural populations ofDrosophila melanogaster

✍ Scribed by C. Biémont

Publisher
Springer Netherlands
Year
1983
Tongue
English
Weight
917 KB
Volume
61
Category
Article
ISSN
0016-6707

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✦ Synopsis

Brother-sister mating effects on offspring viability in natural populations of Drosophila melanogaster were analysed in relation to developmental homeostasis and enzymatic heterozygosity of the individuals constituting the sib pairs. High developmental homeostasis and high degree of heterozygosity are associated with a low inbreeding depression in offspring and, therefore, with a low frequency of major deleterious factors. These resuits are discussed in relation to maintenance of polymorphism in natural populations and the role of genetic load and founder events in speciation and adaptation. We conclude that an unusual environmental condition followed by a strong reduction in effective population size due to random elimination of individuals is a better candidate to speciation than an environmental shift leading to selection for homeostatic, highly heterozygous lethal-free individuals.

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