An autosomal recessive disease in the population has a disease frequency of 1/1600. A deletion of a tryptophan is responsible for 80% of mutant alleles. A deletion of a tyrosine is responsible for 20% of mutant alleles. Which of the following is the approximate fraction of carriers for this disease who carry a deletion of tryptophan?
1/3
1/5
1/10
1/20
1/25
1/35
1/40
