Figure 5. The genetic hitchhiking/selective sweep model.

Figure 5

The genetic hitchhiking/selective sweep model. Each panel shows a sample of 10 chromosomes from a population taken at different time points. The solid boxes represent derived, neutral variants. The open boxes represent a new, positively-selected variant. As the selected variant increases in frequency, linked neutral polymorphisms “hitchhike” along. The result is a decrease in polymorphism and an increase in the frequency of derived variants. If the sweep is incomplete, two divergent haplotype groups may be present in the population.

From: Inferring Evolutionary History through Inter- and Intraspecific DNA Sequence Comparison: The Drosophila janus and ocnus Genes

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