Heteroclinic Cycles and Segregation Distortion
نویسندگان
چکیده
Segregation Distorters are genetic elements that disturb the meiotic segregation of heterozygous genotypes. The corresponding genes are \ultra-sellsh" in that they force their own spreading in the population without contributing positively to the tness of the organisms carrying them. We consider here autosomal two-locus drive systems consisting of a \killer locus" and a \target locus". The diploid population dynamics is approximated by a game dy-namical model leading to replicator equations. We investigate in detail the dynamics of the SD-system of Drosophila melanogaster and the competition of two killer alleles at the same gene locus. We show that heteroclinic cycles are a common type of attractors in models of segregation distortion systems, while they rarely occur in models with Mendelian segregation.
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