A question asked by Jessica: hardy weinberg principle problem?
In a certain population, 40 out of every 1000 births results in an individual that suffers from cystic fibrosis. What is the allele frequency for the recessive allele that causes cystic fibrosis?

Most detailed answer:

Answer by Asst Prof
If 40/1000 are cfcf, then the frequency of cfcf is 0.04. The frequency of cf is sqrt(0.04) or 0.2.

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