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 Post subject: Genetics
PostPosted: Tue Jul 28, 2015 12:54 am 
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Many people don't really care about genetics in animated movies, and I can understand that. However, I did learn a bit about cat coat colour thanks to the Aristocats. Why? I've always wondered "who can Duchess have a red kitten, a black/grey kitten and a white kitten?"


Cats like Duchess are completely white because they have a gene called white masking gene (W or w). W = white. w = non white. a non-white cat is w/w. A white cat can be either W/w or W/W. The gene is dominant so it prevents the "real" colours of the cat to show. Since Duchess has non-white kittens, we know that she is W/w.

But what is her "real" coat colour?

There is another gene that code basic coat colours : red and black. This gene is located on the X chromosome. O is red, o is black (or the absence of red). Normally, males can only be either black or red unless they have a chromosomal anomaly or are a chimera because they only have one X chromosome. Females can be tortoiseshell ("calico" minus the white) because they have two X chromosomes.

Duchess has one red kitten and one black kitten. It doesn't matter whether the father is black or red because she's the one who gives them their X chromosome. We know she is toirtoseshell because she has to have both the O gene and the o gene to have her kittens.

Tl,Dr
Duchess is : W/w, O/o -> tortoiseshell masked by dominant white

Marie
is : W/w but can be O/O, O/o or o/o -> black, red or tortoiseshell masked by dominant white

Toulouse is : w/w and O -> he only has one X chromosome and is red.

Berlioz is w/w and o -> he only has one X chromosome and is black.


There are many other genes coding for coat colours such as colour dillution, albinism ("colourpoint"), tabby marking, piebald gene, etc. I only covered the basic colours because Duchess' family doesn't have any "unusual" colour.


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 Post subject: Re: Genetics
PostPosted: Wed Aug 19, 2015 2:39 pm 
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Interesting. Your idea makes perfect sense of one of my biggest questions about the Aristocats.

But then, what genes does the father have?

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 Post subject: Re: Genetics
PostPosted: Mon Feb 22, 2016 7:37 am 
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My guess is: either a black or a red cat. Could be blue/cream since Berlioz is not pure black but I'm not sure he was intended to be truly grey.


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