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> hey anon, wanna give your opinion?
User avatar #1 - supercookster
Reply +8 123456789123345869
(01/26/2013) [-]
its called heterochromia for any one insterested :)
#2 to #1 - empithree
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has deleted their comment [-]
#3 to #2 - anon id: fabd6a1a
Reply 0 123456789123345869
(01/26/2013) [-]
nah this is a legit cat thing to do with dominance in alleles and the inheritance of them (genetics).

if i remember rightly white fur with blue eyes also comes with deafness in the opposite ear due to the way Hox genes work. dunno how it works with the patches of another colour, as thats down to post-specification variation, which i've not really studied in depth.
User avatar #5 to #3 - martycamp
Reply +1 123456789123345869
(01/26/2013) [-]
Just for your reference, the coloured patches are to do with X-inactivation. Basically, the only type of cat that can get patches are females. Females have two x-chromosomes, and obviously males have an X and a Y. If the cat needed two X chromosomes to express a protein at a required level (in the case, enough to express a colour), males simply couldn't do it. So you only need one X. This requires that females deactivate one of the two X's, otherwise they'd make too much of the protein. The deactivated X then becomes a Barr Body.

Now, a female gets an X chromosome each from her mother and father. Each of the two chromosomes could code for a different protein, which makes a different colour. So, depending on which X is the active one, and which is the Barr Body, you've got the potential to make two different colours. It's completely random as to which X becomes the Barr body, and it happens in each cell after division. So you get patches on the cat that are one colour, and other patches that are the different colour.