Bear with me please, I'm going to try and explain this in short form.....White mutation a natural mutation.. How? it is a sex-linked recessive gene. A bird, hen has 1 X gene, a male has 2 X genes. The Y gene of the hen is to short to carry the gene, so she can carry it on the X, The male if this gene is carried only on one X, you have a normal colored bird, if it's carried on both X on the male, you male a white bird. So , if you remove the melanin [gray] and the color gene, you have a Albino of White Grey.