Question

In our human ancestors, the enzyme lactase, which allows us to digest the milk sugar lactose, was produced only during infancy. Today, many adults can digest lactose, while others cannot. Which group was born with a point mutation in the regulatory DNA of their lactase genes?

Answer 1

The group with mutation is the people who can digest lactose.

Step-by-step explanation:

As said in the question, human ancestors only produced lactose during the first years of life in order to digest breastmilk. Therefore, the production of it during adulthood certainly exposes a mutation in the regulatory DNA of the lactase production genes.