Question

Why did 40% of the human population evolve to tolerate lactose? (1 point)
• People who have an intolerance experience physical pain, so a tolerance evolved to avoid that.
• Babies rely on milk to survive, so they need to be able to tolerate lactose.
• Lactose tolerance allows people to enjoy a wide variety of food, including milk, butter, ice cream, and cheese.
O Within cultures that rely on milk-producing animals, individuals who tolerated lactose had a survival advantage.

Answer 1

Within cultures that rely on milk-producing animals, individuals who tolerated lactose had a survival advantage. This pastoralism created selection for lactase persistence in adults.