Models for lineal effects in rhesus group fissions

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Abstract
Gene distributions in daughter groups produced by three rhesus monkey group fissions are analyzed. Data employed are for the Tf, 6PGD, and CA II electrophoretic marker systems in the fissions producing new daughter groups F and M, F and O, and J and N in the Cayo Santiago rhesus colony. Wide variations in FST values were observed among the different markers in the various fissions. Overall, the observed FST values exceeded predictions of simple random fissioning models. However, on average, observations on electrophoretic markers fitted well with predicted values from lineal fissioning models. One of these lineal fissioning models, a simulation, incorporated the propagation of alleles in the matrilines of the fissioning groups. The second, an algebraic expression, utilized group sizes and average kinship values as parameters.

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