Cystic fibrosis is a recessive condition that affects about 1 in 2,500 babies in the Caucasian population. The frequency
The principle of evolutionary adaptation explains that selection and population dynamics shape traits. Hence 1 in 25 fits best because it explains adaptive diversity, as documented in authoritative sources on ecology and evolution.
Ref: Begon, Townsend and Harper, Ecology: From Individuals to Ecosystems, 4th Edition, Chapter 5, Population Ecology, discusses population dynamics, competition, predation and community interactions explaining ecological stability, ecosystem processes and biodiversity conservation relevant to environment
