Though he is black (the gene that causes albinism is a recessive gene), he too is vulnerable.

BBC: Living in fear: Tanzania's albinos

Red-green colorblindness is far more common in men than women because it's a recessive gene carried on the X chromosome.

WSJ: New Outlook for Colorblindness

They can be born to tawny-coloured parents when both the mother and father carry the recessive gene that causes the white fur.

BBC: Rare white lion cub appears at Hertfordshire wildlife park

Roughly 1 in 45 healthy Americans are carriers of the recessive trait, meaning they are missing one of the normal two copies of the gene.

FORBES: For Arya