A word about genetics
Genes for disease usually (perhaps not always) have to be triggered by something in the environment (including lifestyle). Even for some things that don't have to do with disease. There have been a lot of experiments/studies that show this result.
There are women with genes for breast cancer that never get breast cancer.
At one time there was a lot of talk about a "violence gene". Studies showed: Those with the gene who grew up in a loving peaceful environment never became violent.
Hair color can be changed by environmental conditions. One experiment with a rabbit was interesting: There were rabbits in a cold climate that walked around on snow a lot of the time. Their paws, nose and tail were black (the rest was white) and a scientist wondered if it was the cold that was responsible for the color. So they devised an experiment whereby they affixed an ice-pack to the rabbits back after shaving off some of the hair. When the hair grew back, it was black. So it had a black patch of hair on its back.
Those are just a few examples.
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