Which of the following statements correctly describes color blindness?
Red-green color blindness is more common in women.
Color blindness results from the lack of both red and green cones in the retina.
Color blindness occurs because of environmental factors.
Color blindness occurs in lower levels in Colombia, Spain, and Italy as compared to the United States.

Color blindness, particularly red-green color blindness, is indeed much more common in men than in women, with about 1 in 12 men affected compared to 1 in 200 women. This discrepancy is due to the genetic inheritance pattern of the condition, which is carried on the X chromosome. So, for the majority of cases of red-green color blindness, men bear the brunt!

Interestingly, color blindness primarily arises from inherited genetic factors rather than environmental influences. It usually occurs due to a deficiency in the cones of the retina responsible for detecting red or green light (or both), leading to difficulty distinguishing between these hues. While certain environmental factors can impact vision, they are not the root cause of color blindness itself!