Which of the following forms of G6PD enzymes is the product of a mutant gene located on the X chromosome resulting in a G6PD deficiency that occurs in 10-15% of American blacks?

Question

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Gd A- is the form of G6PD enzyme that results from a mutant gene located on the X chromosome and causes G6PD deficiency in 10-15% of American blacks. The other forms listed (Gd A+, Gd Med, Gd B, Gd Canton) are all normal or variant forms of the G6PD enzyme but are not associated with this particular mutation and deficiency.

Which of the Following Forms of G6PD Enzymes Is the Product