Cultural Influences On Genetic Evolution
Culture can profoundly influence gene frequencies in a population. One of the best known examples is the prevalence of the genotype for adult lactose absorption in human populations, such as Northern Europeans and some African societies, with a long history of raising cattle for milk. Other societies such as East Asians and Amerindians, retain the typical mammalian genotype in which the body shuts down lactase production shortly after the normal age of weaning. This implies that the cultural practice of raising cattle for milk led to selection for genetic traits for lactose digestion. Recently, analysis of natural selection on the human genome suggests that civilization has accelerated genetic change in humans over the past 10,000 years.
Read more about this topic: Dual Inheritance Theory
Famous quotes containing the words cultural, influences, genetic and/or evolution:
“Unfortunately there is still a cultural stereotype that it’s all right for girls to be affectionate but that once boys reach six or seven, they no longer need so much hugging and kissing. What this does is dissuade boys from expressing their natural feelings of tenderness and affection. It is important that we act affectionately with our sons as well as our daughters.”
—Stephanie Martson (20th century)
“The tourist who moves about to see and hear and open himself to all the influences of the places which condense centuries of human greatness is only a man in search of excellence.”
—Max Lerner (b. 1902)
“Man is not merely the sum of his masks. Behind the shifting face of personality is a hard nugget of self, a genetic gift.... The self is malleable but elastic, snapping back to its original shape like a rubber band. Mental illness is no myth, as some have claimed. It is a disturbance in our sense of possession of a stable inner self that survives its personae.”
—Camille Paglia (b. 1947)
“Analyze theory-building how we will, we all must start in the middle. Our conceptual firsts are middle-sized, middle-distanced objects, and our introduction to them and to everything comes midway in the cultural evolution of the race.”
—Willard Van Orman Quine (b. 1908)