Investigating why humans are susceptible to disease.

The following table summarizes the percentage of people in each geographic area who have a specific mutation that causes lactase persistence. The mutation is not found in every population that has a high amount of lactase persistence.

Geographic region

Mutation 1 (%)

West Africa

0

East Africa

0

Middle East 1

10

Middle East 2

0

East Asia

0

Northern Europe

76

Southern Europe

20

What does it mean if all the people who are lactase persistent do not have the same mutation that scientists discovered?

Click to view data about percentages of two other mutations by geographic region.