Since lactase's only function is the digestion of lactose in milk, in most mammal species, the activity of the enzyme is dramatically reduced after weaning. Gene-culture coevolution between cattle milk protein genes and human lactase genes ... the lactase persistence allele frequency and the presence or … Expert Answer Cultural practices play a large role in shaping the human environment and therefore , shaping the ongoing evolution . Milk contains a sugar named lactose, which must be digested by the enzyme lactase … LACTASE Five variants are currently known to underlie this phenotype, which is monogenic in Eurasia but mostly polygenic in Africa. Most people have the phenotype of lactase restriction. View Lactase-Persistence-Lesson-Student.pdf from BIO EVOLUTIONA at Foxcroft Academy. Lactase persistence is the continued activity of the lactase enzyme in adulthood. In other words, genes and cultures coevolve. ... remote content from "data-remote" loads here ... Lactase Illustration × About Educator Resources Help Educator Resources Help This trait represents an adaptation to the domestication of dairying animals and the subsequent consumption of their milk.

Taking advantage of the accumulated ancient DNA data, this Unsolved Mystery article explores where and when lactase persistence emerged.

Since lactase's only function is the digestion of lactose in milk, in most mammal species, the activity of the enzyme is dramatically reduced after weaning. Lactase persistence is one of the clearest examples of niche construction in humans. The Making of the Fittest: Got Lactase?

Lactase persistence, the ability to digest lactose and therefore to drink fresh milk after the nursing period, exemplifies the process of gene-culture coevolution. In some human populations, though, lactase persistence has re The mutation rapidly spread throughout Eurasia between 4000 and 3000 BP, but if Asian herders managed to culturally adapt to …

Lactase persistence is the continued activity of the lactase enzyme in adulthood. Five variants are currently known to underlie this phenotype, which is monogenic in Eurasia but mostly polygenic in Africa. It is unlikely that LP would provide a selective advantage without a supply of fresh milk, and this has led to a gene-culture co-evolutionary model where lactase persistence is only favoured in cultures practicing dairying, and dairying is more favoured in lactase persistent populations.

A classic example of gene-culture coevolution is lactase persistence (LP) in human adults. Despite being a textbook example of regulatory convergent evolution and gene-culture coevolution, the story of lactase persistence is far from clear: Why are lactase persistence frequencies low in Central Asian herders but high in some African hunter-gatherers? Pascale Gerbault.

Explain how the lactase-persistence trait is a convincing example of gene culture coevolution. Lactase persistence—the ability of adults to digest the lactose in milk—varies widely in frequency across human populations.

Lesson Student Handout !

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