Thought this might be of interest ... it relates to the White on both Calicos and Bicolours ...  Katlyn

WHITE SPOTTING GENE SYMBOL "S" vs. non white spotting "s"
? White Spotting is the gene responsible for your typical bicolour cat.
? The White Spotting gene is dominant.
? This gene has what we call Variable Expression, as you can see from the many varied bicolour patterns you see in the cat population, from mere smudges of white, through to all white with smudges of colour
? When a cat has white spotting genes from both parents (i.e. SS), they will have a greater proportion of white than those with the white spotting gene from one parent (i.e. Ss).
? The White Spotting gene also affects other genes. Calicos (Tortoiseshell with white on their bodies ) will have larger patches of colour, as opposed to straight Tortoiseshells (those without any white) where the colours are all mixed.

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