![]() ![]() The authors have declared no competing interest. However, if you have something you really need to ship, you can still do that via FedEx or UPS.Both facilities keep. ![]() This covariation, combined with the absence of geographic barriers that could coordinate cultural and genetic differentiation, suggests that some dialect-level linguistic boundaries have influenced the genetic population structure in England. The United States Postal Service will be closed on Veterans Day. We find that genetic variation and dialect markers have similar spatial distributions on a country-wide scale, and become less distinct as the scale of smaller administrative units such as counties. Here, we analyze spatially dense linguistic and genetic data to examine whether the intensity of differences between and within dialects in England are associated with high genetic rates of change. In particular, language differences may limit population mixing, and we focus on whether subtle, dialect-level linguistic differences have influenced genetic population structure, likely by affecting mating preferences. However, the degree of cultural difference necessary and the magnitude of these effects on gene flow remain unknown. For example, cultural differences can produce barriers to gene flow if they cause groups of people to differentiate themselves from one another. Complicating this picture, cultural traits may themselves influence the ways in which people interact with one another. ![]() Genetics and culture have each been shown to track population movements and demographic history. Genes and languages both contain signatures of human history. ![]()
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