This conclusion remains true despite the seeming small number of migrants per generation: >1 migrant per 18 years does not seem like high rates of exchange, yet, as a general rule, such a level would impede strong divergence in the long term.
With the limited data available, it is difficult to comment about the genomic architecture of speciation and how it facilitates or impedes further divergence.
The IS 4 family is composed of ~70 elements and, like some other families, displays extremely elevated levels of internal divergence impeding its classification.
Here, too, there is a divergence that impedes a forceful European voice on the global stage.
This is distinct from strong purifying selection, where divergence is impeded both within and between species such that the function, which is highly susceptible to changes, is preserved.
Divergence time estimation of these two subpopulations, associated with an investigation of divergent loci that impede free gene flow, is currently underway in the laboratory to test this last hypothesis.
Migration limits the genetic divergence of populations and so impedes the process of speciation.
Extensive genetic diversity in viral populations within infected hosts and the divergence of variants from existing reference genomes impede the analysis of deep viral sequencing data.
Glacial-interglacial climate fluctuations during the Pleistocene led to changes of sea level [ 1, 2] and then caused habitat contractions or expansions [ 3], which impeded gene flow of marine species and resulted in genetic divergence.
Constant negative selection impedes allele replacements and, therefore, is routinely assumed to decelerate sequence divergence.
