We found that nucleotide divergence did not obviously limit the locations of recombination tracts, although there were small but significant reductions in divergence at recombination breakpoints.
This process leads to a severe reduction in the divergence rate between paralogous genes from the same species but not when comparing different species (see for instance [4]).
Decreasing the number of moths in the population from 300 to 200 has little effect on the co-evolutionary process, but a further reduction to 100 individuals or fewer leads to a marked reduction in the divergence between proboscis length of the two pollinator species, and no differentiation whatsoever in the depth of corolla tubes of the two plant species (Fig. 7).
In general, domestication loci can exhibit very strong LD, because of reduction in genetic divergence.
The lack of a local reduction in synonymous divergence thus supports the interpretation that this region has recently undergone a selective sweep in A. thaliana.
This controversial hypothesis was based on two major pieces of evidence: the large fluctuation of H-C sequence divergence throughout the genome and a dramatic reduction in H-C sequence divergence on the X chromosome.
The results are shown in table 2 and indicate that for Ex1 a reduction in nucleotide diversity versus divergence is detectable in the AS sample although the result is not statistically significant.
Third, the HKA test also indicated a local reduction in variability relative to divergence at the CYP3A locus compared with the neutral DMD intron 44 (Nachman and Crowell 2000).
The analysis of Burgess and Yang (2008), under models of constant τHC across the genome, suggested that the reduction in H-C sequence divergence on the X was mostly due to a reduced population size (θHC) rather than a reduced species divergence time (τHC).
Genome reduction has played a modest role in divergence of the Bc species-group [ 26], likely being responsible for the reduced genome size of Bc NVH391-98.
