Summary: Part 5

We don’t know why some alleles are frequent in a population.

  • The PTC taster and non-taster alleles are both common in populations worldwide.
  • We don’t know what the selective pressure is.
A pair of pie charts, one titled Africans and the other titled Non-Africans. The Africans pie chart has 4 sections, labeled P-A-V, A-V-I, A-A-I, and A-A-V, from largest to smallest. The Non-Africans pie chart has 3 sections, labeled P-A-V, A-V-I, and A-A-I, from largest to smallest.
Tasters and non-tasters in Africans and non-Africans. PAV=tasters; AVI= non-tasters; AAI/AAV=intermediate tasters