A person whose ancestors were cattle herders is more likely to express the lactase gene as an adult.

Question

Quizplus · Accepted Answer

This is because cattle herders traditionally kept and drank milk from their cattle, thus their bodies evolved to continue producing lactase into adulthood to be able to digest lactose in milk. Other populations that did not consume milk regularly did not have this evolutionary adaptation and are more likely to be lactose intolerant as adults.

A Person Whose Ancestors Were Cattle Herders Is More Likely