Perhaps this is the big pink elephant in the room, but I think it needs to be said.
Every day when I'm at work and I go to the bathroom, I get to see a DC Comic poster full of DC comic characters. It's astounding to me that so many of these people with mutant or superhuman powers are white. I'm not sure what kind of statement DC is trying to make, but it seems to me that this goes pretty across the board for comic books. It might be because more white people read comics (is this true?), or it might be due to inbreeding.
Traditionally, mutations occur in nature when a species procreates with a creature very close to it's own bloodline. Consider the cheetah. Due to disease, loss of habitat, competition for prey and over-hunting of prey (leading to starvation), the overall population of cheetahs is very low. This means there is a very small gene pool to choose from when procreating, leading to many issues for the cheetah community such as a reduction in fertility, loss of immune system in subsequent generations and genetic disorders. Now this is where the connection comes in. Genetic disorders, often considered negative, really are just abnormalities in genes or chromosomes. What else is an abnormality in genes? The X gene, or the part of the DNA which makes a normal person an X-man or villain, depending on their goals, dreams and general outlook on life.
I'm not saying that inbreeding is the only way to obtain an X-gene or any other genetic anomaly which may or may not create mutant powers, but with all these white people running around getting powers while minorities don't, it really starts to make you wonder. Perhaps Jean Grey and Scott are 1st cousins and don't even know it. Either way, I think it's quite odd that if you look at a poster of comic book characters you'll see a lot of white people, a few green people, maybe some blue, silver, or pink people and then a couple (if even) people of other races.