Which of the following statements about lactase persistence in humans are true? Please select all that apply.

Question

Quizplus · Accepted Answer

Lactose intolerance is the ancestral condition, and lactase persistence is the derived condition. Globally, most people do not exhibit lactase persistence. Mutations conferring lactase persistence are not in the lactase gene, but in the upstream regulatory region that controls lactase expression. In lactase-persistent individuals, production of lactase is not turned off after infancy. Lactase persistence is an example of positive selection. In populations that utilized milk as a food source, mutations that led to lactase persistence conferred a reproductive advantage and were positively selected. However, the mutation rate in the lactase gene is the same in all populations - it is the difference in selective pressure that maintained lactase-persistence mutations in some populations and not others.

Which of the Following Statements About Lactase Persistence in Humans