A member asked:

Why is my brother color blind when i'm not?

A doctor has provided 1 answer

Are you female?: Color deficiency is most common in males as it is carried on the X chromosome. Your brother has an equal chance of getting one or the other X from your Mom and one of these had the deficient gene. If you are male, then you got the other one. If you are female then you might have one deficient X gene but your other, from your father, is normal.

Answered 12/6/2014

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