Hemophilia is an X-linked recessive disease. It occurs in about 1/4000 males. (This tells you the frequency of the disease-causing allele). Under the Hardy-Weinberg model, how often should it occur in females?
1) 1/4000
2) 2(1/4000)(3999/4000)
3) (1/4000)²
4) (3999/4000)²