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• W1773380360 startingPage "791" @default.
• W1773380360 abstract "Abstract In(2LR)PL is a large pericentric inversion polymorphic in populations of Drosophila melanogaster on two Indian Ocean islands. This polymorphism is puzzling: because crossing over in female heterokaryotypes produces inviable zygotes, such inversions are thought to be underdominant and should be quickly eliminated from populations. The observed fixation for such inversions among related species has led to the idea that genetic drift can cause chromosome evolution in opposition to natural selection. We found, however, that In(2LR)PL is not underdominant for fertility, as heterokaryotypic females produce perfectly viable eggs. Genetic analysis shows that the lack of underdominance results from the nearly complete absence of crossing over in the inverted region. This phenomenon is probably caused by mechanical and not genetic factors, because crossing over is not suppressed in In(2LR)PL homokaryotypes. Our observations do not support the idea that the fixation of pericentric inversions among closely related species implies the action of genetic drift overcoming strong natural selection in very small populations. If chromosome arrangements vary in their underdominance, it is those with the least disadvantage as heterozygotes, like In(2LR)PL, that will be polymorphic or fixed in natural populations." @default.
• W1773380360 created "2016-06-24" @default.
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• W1773380360 date "1991-11-01" @default.
• W1773380360 modified "2023-09-30" @default.
• W1773380360 title "Lack of underdominance in a naturally occurring pericentric inversion in Drosophila melanogaster and its implications for chromosome evolution." @default.
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• W1773380360 doi "https://doi.org/10.1093/genetics/129.3.791" @default.
• W1773380360 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1204747" @default.
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