Does gene flow inhibit speciation?
For this reason, gene flow has been thought to constrain speciation and prevent range expansion by combining the gene pools of the groups, thus preventing the development of differences in genetic variation that would have led to differentiation and adaption.
Does gene flow cause speciation?
In contrast, restricted gene flow promotes population divergence via selection and drift, which, if persistent, can lead to speciation.
Does gene flow accelerate speciation?
the inhibitory effect of gene flow, increasing the speciation probability. We see similar results when populations in a standard two-locus, two-allele Dobzhansky-Muller model are subject to simultaneous directional selection and gene flow.
What effect does gene flow have?
The effect of gene flow is to reduce genetic differences between populations, thereby preventing or delaying the evolution of the populations in different geographical areas into separate species of the pathogen.
Why does gene flow reduce local adaptation?
Basic theory predicts that gene flow disrupts the adaptation process if selection is not strong enough to prevent the loss of advantageous alleles (Haldane 1930).
How does gene flow change allele frequencies?
The introduction of new alleles through gene flow increases variability within the population and makes possible new combinations of traits. Although gene flow does not change allele frequencies for a species as a whole, it can alter allele frequencies in local populations.
Why does gene flow prevent speciation?
Gene flow strongly acts against speciation, by recombining the gene pools of the groups, and thus, repairing the developing differences in genetic variation that would have led to full speciation and creation of daughter species.
How does gene flow reduce adaptation of population?
On the one hand, gene flow may break down local adaptation and reduce fitness by introducing maladapted genes. On the other hand, gene flow may increase fitness by adding genetic variation to small, inbred populations. Moreover, gene flow may have important effects on population growth and dynamics.
Is gene flow directional?
Although there was a degree of spatial structure, our phylogeographic analyses support frequent gene flow between populations and the direction of gene flow, primarily from north to south, corresponds to the route of seed potato transportation, suggesting a role of human activities in the dispersal of P.