miss a asked:

Cystic fibrosis is a genetic disease of humans caused by homozygosity for a recessive gene (aa). In a particular large population, the frequency of newborns affected wth cystic fibrosis is 1 in 3,600. In this population, what proportion of marriages between genetically unrelated normal individuals is at risk of producing a child affected with cystic fibrosis? Is it:

1 family in 30

1 family in 300

1 family in 36

1 family in 900

1 family in 15

Technorati Tags: Population, Proportion, Recessive Gene