21. Individuals who expressed lactase -persistent phenotypes would have had a significant advantage in nutritional acquisition. 22. The evolutionary processes driving the rapid spread of lactase persistence in some populations are not known. 23. In most Europeans, however, the infant condition persists, and the lactase gene remains active. 24. Presumably the changes regulate the activity of the lactase gene in some manner yet to be understood. 25. Several milk products _ including the brand milk you mentioned, Lactaid _ are fortified with lactase . 26. Like most other adult mammals, adult cats are lactose intolerant because of low or absent lactase . 27. Four novel mutations in the lactase gene ( LCT ) underlying congenital lactase deficiency ( CLD ). 28. Four novel mutations in the lactase gene ( LCT ) underlying congenital lactase deficiency ( CLD ). 29. The overall reaction that lactase catalyzes is C 12 H 22 O 11 + H 2 O ? 30. For those with lactose intolerance, taking digestive enzymes containing lactase when consuming dairy products often improves symptoms.
