A couple comes for preconceptional genetic counseling because they both have a family history of -thalassemia. The woman has a minimally decreased hemoglobin concentration. Genetic studies show a sing

A couple comes for preconceptional genetic counseling because they both have a family history of -thalassemia. The woman has a minimally decreased hemoglobin concentration. Genetic studies show a single gene deletion. The man has microcytic anemia and a two-gene deletion. If the two-gene deletion is in trans (one deletion on the maternal gene and one deletion on the paternal gene), which of the following percentages of their offspring will have a two-gene deletion?