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Although the selective advantages of lactase persistence have been discussed, there have been studies of ethnic groups whose populations, despite relying heavily on milk consumption, currently have a low frequency of lactase persistence. [13] A study of 303 individuals from the Beja tribe and 282 individuals from various Nilotic tribes in Sudan ...
Added Portugal and Spain to the 60-70% range that the sources claim. There are other inaccuracies in the map. 08:54, 12 July 2017: 512 × 402 (124 KB) Joe Roe: Recoloured sample locations based on the actual value at that location. 21:13, 3 July 2017: 512 × 402 (94 KB) Joe Roe: User created page with UploadWizard
English: Interpolated map of the percentage of adults with a known lactase persistence genotype (-14010 G>C, -13915 T>G, -13907 C>G or -13910 C>T) in the indigenous population of the Old World. Circles mark the sample locations.
Lactase persistence in humans evolved relatively recently (in the last 10,000 years) among some populations. Around 8,000 years ago in modern-day Turkey, humans became reliant on newly-domesticated animals that could be milked; such as cows, sheep, and goats. This resulted in higher frequency of lactase persistence. [77]
Lactase persistence is a rare ability among mammals. [74] Because it involves a single gene, it is a simple example of convergent evolution in humans. Other examples of convergent evolution, such as the light skin of Europeans and East Asians or the various means of resistance to malaria, are much more complicated.
The majority of humans actually follow this protocol as well, and down-regulate lactase production around 3-5 years of age. Interestingly, though, the majority of caucasians, mainly those from northern european background, continue to have elevated lactase activity all the way into adulthood, and so they exhibit “lactase persistence”.
Lactase (EC 3.2.1.108) is an enzyme produced by many organisms and is essential to the complete digestion of whole milk.It breaks down the sugar lactose into its component parts, galactose and glucose.
But between these two and the "Lactase persistence" section of this article I think there's easily enough material to fork off a separate lactase persistence article as I suggested above. joe•roe t•c 09:26, 1 September 2011 (UTC) Greetings. What prompted me to add that article link to the 'See also' section was the map.