The rate of cystic fibrosis among Caucasian-American births…

The rate of cystic fibrosis among Caucasian-American births is about 1 in 2,500.  If the Caucasian-American population is in genetic equilibrium (Hardy-Weinberg equilibrium) for the gene involved in cystic fibrosis, then the frequency of Caucasian-Americans who are carriers (heterozygous) for cystic fibrosis is approximately: