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Lactase enzyme which is responsible for the digestion lactose (a disaccharide milk sugar) normally its production decreases when a young mammal is weaned but mostly Humens continue to produce this enzyme throughout adulthood, this ability is termed as lactase persistence. What is the reason and mechanism of this phenomenon? what are the evolutionary basis of lactase persistence?

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    $\begingroup$ Welcome Dr. Uzair Ali. We are expected to show the results of our own investigations into a subject here, you can edit to tell us what your searches found and where the sticking points are. You should also take our tour and refer to the help center for guidance as to the ways of any site you post on and see our homework-question policy. Enjoy the Stackexchange network. $\endgroup$ Feb 19, 2022 at 8:27
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    $\begingroup$ Interesting question. This paper, Evolution of lactase persistence: an example of human niche construction, published in a very reliable source, argues that lactase persistence is an example of niche construction: "Niche construction is the process by which organisms construct important components of their local environment in ways that introduce novel selection pressures. Lactase persistence is one of the clearest examples of niche construction in humans". The pdf seems to be freely available from the journal site $\endgroup$
    – user338907
    Feb 21, 2022 at 10:12

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