How do scientists identify chromosome regions that have experienced recent natural selection?

In the field of Darwinian medicine, scientists identify chromosome regions that have undergone strong recent natural selection by utilizing advanced methods in population genetics.

These techniques involve analyzing genetic data to detect specific signatures of selection within the genome. By examining variations in DNA sequences across populations, researchers can pinpoint locations where selective pressures have favored particular traits—such as the ability to digest milk in adulthood, which is associated with regions near the lactase gene.1

Furthermore, the use of genomic databases and the identification of polymorphisms allow scientists to define haplotypes. These markers help distinguish specific regions of the human genome, enabling researchers to conduct association and linkage studies that reveal how certain genetic differences may have been shaped by selection to either predispose individuals to or protect them from disease.2