Which single-gene defect disorder is fairly common affecting 1 in 300 Caucasians?

Name: Which single-gene defect disorder is fairly common affecting 1 in 300 Caucasians?
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Hemochromatosis is a single-gene defect disorder that affects the regulation of iron absorption in the body. It is fairly common in Caucasians, with a frequency of 1 in 300. Galactosemia, sitosterolemia, muscular dystrophy, and PKU are also single-gene defect disorders, but they are less common than hemochromatosis in Caucasians.

Which Single-Gene Defect Disorder Is Fairly Common Affecting 1 in 300