"Kitten is One in 100,000"

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Tortoiseshells are generally female cats because only the female X chromosome carries the gene that creates the distinctive coloring. A tortoiseshell must inherit two dominant colors in order to develop the mixture of ginger and black colors displayed on their coat.

We rarely see a male tortoiseshell due to the genetic and developmental factors. However, in Harpenden, UK a kitten who was rescued and brought to Alistair Poole's veterinary surgery, was discovered a tortoiseshell but determined to be a boy. He came from a litter with 2 other tortoiseshells where they shared the same coloring and look, but he stood out by being the only male tortie.

This is a one in 3,000 chance worldwide to have a male tortie, but in UK it occurs only 2 - 3 times a year, making him one in 100,000.

A male tortie typically has an extra X-chromosome that harbors the dominant color gene, so instead of having XY for a typical male cat, he has XXY to make up his DNA.

"We've decided to call him Eddie after Eddie Izzard, the comedian, as he is essentially a boy dressed in girls' clothing - Eddie Izzard sometimes does the same."  - Kitten is one in 100,000

Source and Image:

http://www.watfordobserver.co.uk/news/4568384.Kitten_is_one_in_100_000/

http://en.wikipedia.org/wiki/Tortoiseshell_cat

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