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Heteroclinic Cycles and Segregation Distortion

✍ Scribed by Bärbel M.R. Stadler

Book ID
102612104
Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
488 KB
Volume
183
Category
Article
ISSN
0022-5193

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✦ Synopsis

Segregation Distorters are genetic elements that disturb the meiotic segregation of heterozygous genotypes. The corresponding genes are ''ultra-selfish'' in that they force their own spreading in the population without contributing positively to the fitness 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 dynamical 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 attractor in models of segregation distortion systems, while they rarely occur in models with Mendelian segregation.

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