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A pervious study has shown the inadequacy of first-cousin marriages as a measure of possible genetic isolates. In this study, data from the Swedish Civil Register extending backward for several hundreds of years have been used to study the influence of distance and population density on social isolation. The study was conducted in nine rural parishes from three Swedish counties. For each parish the data provided include population by age and sex, analysis of marriages by the distance separating the birth parishes of partners, fertility, and family size.
The role of distance in the selection of marital partners is calculated for the years 1800-1824 and 1825-1849, making use of a model devised by Sewell Wright. A forest parish in the northern sparsely populated region is the only one for which there was evidence of genetic isolation during the past 150 years. This is the same region which was shown
Schweitzer MD. A Study of the Population Movement in Nine Swedish Subpopulations in 1800-49 From the Genetic-Statistical Viewpoint. Arch Neurol. 1966;15(3):336. doi:10.1001/archneur.1966.00470150114019
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