MDH-polymorphism inDrosophila subobscura: I. Selection and hitch-hiking in laboratory populations
✍ Scribed by W. Pinsker
- Publisher
- Springer
- Year
- 1981
- Tongue
- English
- Weight
- 509 KB
- Volume
- 60
- Category
- Article
- ISSN
- 0040-5752
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✦ Synopsis
The interrelation of genic polymorphism at the Malate dehydrogenase (Mdh)-locus and chromosomal polymorphism for superimposed gene arrangements was studied in 5 experimental populations of Drosophila subobscura. It could be shown that chromosomal polymorphism is maintained by balancing selection in favour of the heterozygotes. In contrast, selection at the Mdh-locus itself seems to be of minor importance. The changes of frequency observed for the Mdh-alleles are most probably due to hitch-hiking on the gene blocks enclosed by the chromosomal structures or to selection for tightly linked genes rather than to fitness differences between Mdh-genotypes. The results may be considered as a model for the situation found in natural populations of D. subobscura.