Explanation: Boys are more likely to be color-blind than girls. Estimates are that at least one in every 12 boys has some level of color blindness. But girls can be color-blind, too. It only happens in about one of every 200 girls.
In most cases, color blindness doesn't mean that you can't see any color. Instead, you have trouble telling the difference between certain colors, usually red and green. There is also blue-yellow color blindness, but it's much rarer. And a very few people are truly color-blind, a condition called monochromacy.