This is due to how parents pass down a chromosome associated with the male sex. Males have only 1 x chromosome from their mother Males get an x chromosome from their mother and a y chromosome from their father, while females get an x chromosome from each parent
Standard Biology Chapter 27 Human Genetics - ppt video online download
Males only need to have one abnormal gene on their one x chromosome to be color blind, while women need to have the abnormal gene on both of their x chromosomes.
It is a common misconception that color blindness always equals monochromacy
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