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The distribution of heterozygosity in temperate and tropical species of Drosophila

Published online by Cambridge University Press:  14 April 2009

B. D. H. Latter
B. D. H. Latter
Affiliation:
Faculty of Agriculture, University of Sydney, 2006, Australia

Summary

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Electrophoretic surveys for nine species of Drosophila have been summarized in terms of the relative contribution to heterozygosity of each of ten gene frequency classes, the mean frequency of heterozygotes within subpopulations, and the degree of genetic divergence between subpopulations. It has been shown that the neutral model proposed by Kimura, and modified by Ohta to include the accumulation of slightly disadvantageous mutations, is capable of explaining all features of the data. The consistent difference between group I and group II enzymes can be explained by a difference in the average intensity of selection against mutational variants in the two groups. A highly significant difference between the temperate and tropical species in the distribution of heterozygosity appears to be due to the smaller effective breeding population sizes in the case of the temperate species.

Type
Research Article
Information
Genetics Research , Volume 38 , Issue 2 , October 1981 , pp. 137 - 156
Copyright
Copyright © Cambridge University Press 1981

References

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