Q If you were looking at a female you would see an XX on the 23rd pair. We know that because the 23rd pair is XY that we are looking at a male. The 23rd pair is also the reason why certain genetic traits are more common in one gender than the other. For example, color blindness is much more common in men than it is in women. Also note, color blindness is a recessive gene located on the X chromosome. Given what you now know about dominant and recessive genes and what XX means and what XY means, can you figure out why men have more color blindness than women? It's kind of fun to try to figure out. Also remember that if you are having trouble viewing the image, it is the same image shown in the module.