Biocultural Evolution

Biocultural evolution refers to the interacting processes through which biological and cultural change shape one another in human populations over time. Rather than treating nature and culture as separate causes, the concept holds that cultural practices alter selective pressures on the body, while biological capacities make cultural learning and transmission possible. A frequently cited example is lactase persistence, which spread in populations that practiced dairy farming. Charles Darwin's theory of natural selection provides the foundation, and Clifford Geertz argued that humans are incomplete animals completed through culture, with brain evolution and symbolic life developing together. Luigi Luca Cavalli-Sforza and Marcus Feldman modeled cultural transmission in terms comparable to genetic inheritance, while Robert Boyd and Peter Richerson developed dual inheritance theory, and Joseph Henrich emphasized cumulative cultural learning as a driver of human success. Edward O. Wilson's sociobiology sparked controversy by seeking biological explanations of social behavior. Sociologists and anthropologists often caution against biological determinism and the misuse of evolutionary arguments to justify inequality. Biocultural evolution remains important for debates about human nature, cooperation, health, adaptation, and the relationship between genes, environment, and society.