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Rainfall-driven sex-ratio genes in African buffalo suggested by correlations between Y-chromosomal haplotype frequencies and foetal sex ratio.
|Title||Rainfall-driven sex-ratio genes in African buffalo suggested by correlations between Y-chromosomal haplotype frequencies and foetal sex ratio.|
|Publication Type||Journal Article|
|Year of Publication||2010|
|Authors||van Hooft P, Prins HHT, Getz WM, Jolles AE, van Wieren SE, Greyling BJ, van Helden PD, Bastos ADS|
|Journal||BMC evolutionary biology|
|Keywords||Animals, Buffaloes, Climate, Female, Fetus, Haplotypes, Male, Microsatellite Repeats, Sex Ratio, South Africa, Y Chromosome|
The Y-chromosomal diversity in the African buffalo (Syncerus caffer) population of Kruger National Park (KNP) is characterized by rainfall-driven haplotype frequency shifts between year cohorts. Stable Y-chromosomal polymorphism is difficult to reconcile with haplotype frequency variations without assuming frequency-dependent selection or specific interactions in the population dynamics of X- and Y-chromosomal genes, since otherwise the fittest haplotype would inevitably sweep to fixation. Stable Y-chromosomal polymorphism due one of these factors only seems possible when there are Y-chromosomal distorters of an equal sex ratio, which act by negatively affecting X-gametes, or Y-chromosomal suppressors of a female-biased sex ratio. These sex-ratio (SR) genes modify (suppress) gamete transmission in their own favour at a fitness cost, allowing for stable polymorphism.
|Alternate Journal||BMC Evol. Biol.|