Reduction of neutral gene flow due to the partial sterility of heterozygotes for a linked chromosome mutation.
The effect of linkage between a chromosome mutation producing partially sterile heterozygotes and a neutral locus in reducing the gene flow at the neutral locus is studied using a two-population deterministic model. Chromosome mutations are more efficient in reducing gene flow with low migration rates than with high ones. The interaction between high values of partial heterozygote sterility and low recombination rates can produce, in the low migration pattern, a drastic reduction of gene flow. Nevertheless, since only chromosome mutations with low values of partial heterozygote sterility are likely to be involved in chromosomal speciation, a significant reduction of gene flow will probably occur only for a very limited part of the genome. Therefore, a single chromosome mutation is unlikely to play a primary role in speciation.
D005075:Biological Evolution; D001699:Biometry; D002875:Chromosomes / Q000502:physiology*; D005796:Genes; D008040:Genetic Linkage; D006579:Heterozygote; D007246:Infertility; D008957:Models, Genetic; D009154:Mutation