Environmental and cultural factors can affect whether a new human mutation becomes common in a population.
Where and when did humans arise? What distinguishes us from other species? Did our distant ancestors look and behave like us?
Genetic evidence shows that humans evolved in Africa and continue to evolve.
How humans perceive bitter taste, and the evolution of taste perception.
Lactose tolerance, sickle cell anemia, and bitter taste perception are three examples of recently evolved human traits.