Abstract

Some results of Kingman, Griffiths, and Ewens are unified in a probability distribution for the genealogical structure of a random sample of genes. The sample is partitioned into equivalence classes of two types, “old” and “new.” Old classes of genes are each descended from founder genes in a reference ancestral population without mutation, while new classes descend from more-recent mutant founders. From the probability distribution of the partition, some old and some new results are derived concerning allele frequencies in samples.

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