Gene flow past a cline Barton, Nicholas H ; https://orcid.org/0000-0002-8548-5240 The effect of a cline as a barrier to gene flow at closely linked, weakly selected loci is investigated using a continuous diffusion model. It is shown that a linked cline induces a step in the frequency of a neutral allele, which is proportional to the gradient in neutral allele frequency and to the inverse of the recombination rate. A barrier to dispersal or a local region of low abundance has a similar effect (Nagylaki, 1976). The cline will block the flow of neutral alleles over a region of chromosome roughly 2s/t map units long. However, a slightly advantageous allele will be little affected, and must be very tightly linked to be delayed for long. Springer Nature 1979 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/3673 Barton NH. Gene flow past a cline. <i>Heredity</i>. 1979;43(3):333-339. doi:<a href="https://doi.org/10.1038/hdy.1979.86">10.1038/hdy.1979.86</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1038/hdy.1979.86 info:eu-repo/semantics/altIdentifier/issn/0018-067X info:eu-repo/semantics/altIdentifier/e-issn/1365-2540 info:eu-repo/semantics/openAccess