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How rare is color blindness? How many people in your family are color blind?


I ask this question because of a debate between my daughter's health teacher and herself. The teacher was explaining how rare it is, but my daughter disagreed due to how many family members are color blind. She doesn't think it is that rare, but he claimed it is. Could anyone break down how common it is? Along with why so many members (by blood, or married into the family) are color blind. Thanks!

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