decreasing levels of the enzyme lactase-phlorizin hydrolase, encoded by LCT. However,
some individuals maintain high enzyme amounts and are able to digest lactose into
adulthood (ie, they have the lactase-persistence [LP] trait). It is thought that selection has
played a major role in maintaining this genetically determined phenotypic trait in different
human populations that practice pastoralism. To identify variants associated with the LP trait …