gene conversion

Sánchez-Gracia A & Rozas J 2011 Molecular population genetics ofthe OBP83 genomic region in Drosophila subobscura and D. guanche: contrasting the effects of natural selection and gene arrangement expansion in the patterns of nucleotide variation. Heredity 106:191-201.

• there are 50 DNA polymorphisms shared between the arrangements, with no fixed difference between them
• the two chromosomal classes are highly differentiated (S_nn = 0.965; P < 0.0001)
• we also examined whether this number of shared mutations (between arrangements) could have arisen independently in each arrangement (parallel mutations) or whether they might have been incorporated by some recombination mechanisms
• assuming a homogeneous mutation rate across silent sites, our results indicate that this observed number of shared mutations is extremely unlikely under the parallel mutation scenario
• the expected number of shared polymorphisms is 2.67 ± 1.6, P < 0.001
• these shared polymorphisms should be explained by recombination between chromosomal classes
• these tracts do not show any significant directionality