Lactose Intolerance Essay

Lactose Intolerance Essay-9
And while it’s not likely milk consumption Justin Cook is an assistant professor of economics at the University of California-Merced.His research focuses on the role of genetic differences in explaining economic outcomes.Justin Cook is an assistant professor of economics at the University of California-Merced.

And while it’s not likely milk consumption Justin Cook is an assistant professor of economics at the University of California-Merced.His research focuses on the role of genetic differences in explaining economic outcomes.Justin Cook is an assistant professor of economics at the University of California-Merced.

This is shown in Figure 1, which plots historical lactose tolerance frequencies for the Old World (Europe, Asia and Africa). Country-level lactase persistence frequencies across the Old World.

Darker areas represent more lactase persistent populations.

First, milk allowed farmers to obtain a greater quantity of calories from fixed resources — the stock of domesticated animals and the land needed to sustain these animals.

In a sense, dairying represents a technological innovation, in which available resources — that is, land and domestic animals — were used in a novel way to increase output.

These genetic adaptations differ across ethnic populations and are ultimately the result of differences in historic environments.

Lactose tolerance, which enables milk consumption, is a prime example.

Finally, the consumption of milk increased a woman’s fertility.

The infertility period after giving birth is associated with lactation.

Individuals with this mutation produce lactase throughout their lives, while those without this mutation do not. The selection of the lactase persistent allele, or genetic variant, coevolved with the cultural practice of dairying: Without milk, the benefit conferred by lactase persistence is non-existent.

Therefore, the lactase persistence allele could only be selected after the domestication of cattle and other milk producers.

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