Multiple choice

Lactase deficiency is

  1. equally common throughout the world

  2. at its highest frequency in Europe

  3. at its minimum frequency in Asia

  4. none of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lactase deficiency has a non-random distribution. Generally, it is the least common among Europeans. Asians and Native Americans have very high frequencies. In Africa, there are regions of extremely high frequency and others of low frequency.