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slowmotion

Quite dreadful
Location
lost somewhere
Now that, my friends, was mundane.
You put us all to shame.
 
Morning @hopless500 have a :birthday:Happy birthday.
Thank you :smile:
 

Hill Wimp

Fair weathered,fair minded but easily persuaded.
Umm, not quite. There is no genetic slip up - and it's quite simple really. ;) Brindle torties are far from rare.

Firstly, the gene for white spotting (S) is independent of other genes for colour / pattern. A cat is just as likely to not have white spotting as having it.

Tortoiseshell colouring is sex-linked and only (other than in some very rare cases) occurs with female cats. This is down to the fact that the y chromosome is too small to hold any genetic information for colour - colour genes are only found on the x chromosome.

Hence, a male cat can either only be orange (O) or non-orange (o) i.e. ginger or not, since as an xy, he only has a single x chromosome.

Female cats have two x chromosomes and therefore have two sets of genes pertaining to colour.

For a female cat to be ginger, she must have *two* copies of the O gene, one on each x chromosome i.e. she is OO

If a female cat only has one copy of the orange gene, i.e. she is Oo, then she will be a tortie of some description, with the non-orange part of her colouring being solid or tabby.

And if a female cat has no copy of the orange gene i.e. she is oo, then she will be black or tabby or some variant thereof. :okay:

Henry's mum was a Tortie.She had a real mixed bunch of a litter.

I didn't get Sasha until she was 18mths old so I know nothing of her parentage.
 
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