| 11. | :" Saccharomyces cerevisiae " has nearly no natural lactase activitiy.
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| 12. | Lactose intolerance results from a deficiency of lactase.
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| 13. | Most people have an enzyme, lactase, that breaks down that particular sugar.
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| 14. | This results in lactase deficiency, also called " lactose intolerance ".
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| 15. | The genetic variations for lactase persistence and greater height came with the Yamna people.
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| 16. | Young led the first studies to show a hereditary lactase deficiency in Hispanic people.
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| 17. | Hence, it was in these regions that genes for lifelong lactase production first evolved.
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| 18. | What do you mean by lactase persistent?
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| 19. | Some people lose the ability to produce lactase between two and five years of age.
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| 20. | All children are born with the intestinal enzyme lactase, which is necessary for digesting milk.
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