Abstract
Mathematical models of four well-known naturally occurring systems of segregation distortion are compared. These include the sex-ratio chromosome of Drosophila pseudoobscura, the Segregation Distorter (SD) complex of D. melanogaster, the t locus in Mus musculus, and the sex-ratio system in Aedes aegypti. Dynamics of these models are compared with the classical one-locus multiple-allele viability system. For the SD complex and the sex-ratio model of A. aegypti, the role of recombination is reviewed. Departures from Mendelian segregation cause fascinating irregularities in the relationship between linkage and linkage disequilibrium, as well as in predictions for the evolution of recombination itself.
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