The inheritance pattern for red-green color blindness is different for males compared to females. Red-green color blindness is much more common in males than in females. What does this suggest about the gene for red-green color blindness?

The gene that causes color blindness is linked to the X chromosome and it is much more frequent in males than females because females have two X chromosomes. So for a female to suffer from color blindness, both of her X chromosomes should carry the genetic disorder.