Why has cystic fibrosis persisted at such a high percentage in some populations?
A) affected individuals reproduce before the disease is fatal
B) there is an advantage to being a carrier
C) recessives have a higher fitness than dominants
D) it is an easily treated disease
E) the symptoms disappear in early adulthood

Question

Quizplus · Accepted Answer

Being a carrier of the cystic fibrosis gene mutation provides a heterozygote advantage, particularly in regions where diseases like cholera or typhoid fever are prevalent, as carriers may have some resistance to these diseases.

Why Has Cystic Fibrosis Persisted at Such a High Percentage