= Population geneticist
A <population geneticist> studies variation in <allele frequencies>, its evolutionary causes and the ancestry of sampled genetic material. The work combines <genetics>, <probability> and empirical data to investigate processes including <natural selection>, <genetic drift> and <gene flow>. For example, comparing alternative demographic models can test whether an observed pattern is better explained by <biological population> separation or continuing exchange, subject to the model assumptions. <A weakly structured stem for human origins in Africa by Aaron P. Ragsdale and others>[2023, contrasting demographic models of human origins]{ref}
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