The Tortie Point Siamese Cat

Just what is a Tortie Point Siamese cat?

A Tortie Point or 'tortoiseshell' Siamese is a cat that, instead of having solid points, has points that look like a tortoise shell.

Let's take Seal, Blue or Caramel Points as examples.

In the Tortie Point version of these, their face, nose, ears, legs, feet and tail are found in often unusual and beautiful mottled or spotted combinations, of Seal/Red, Blue/Cream and Caramel/Apricot.




So how do you get a Tortie Point?

The Tortie Point Siamese has come about through some complicated breeding.

Bear with me, this might take some explaining, and I'm certainly not a geneticist, so, in very simple terms ...

Tortie genetics for beginners

Purebred Seal, Blue, Chocolate and Lilac, as well as Cinnamon, Caramel and Fawn Point Siamese don't carry the orange or 'O' gene.

The gene that codes for orange effectively turns black coloring into ginger, in cats. Red, apricot and cream are all shades of ginger caused by the presence of the orange gene.

When a Siamese in one of the solid colors (Seal, Blue, Chocolate, etc., which don't have the orange gene) is crossed with a cat that does have the orange gene, one of several things may happen. But first ...

Blue Tortie Point Siamese Cat

Blue Tortie Point Siamese
photo: © Martin Bahmann | Creative Commons

Some slightly more advanced genetics

If you know anything about genes, you'll know that they're carried on chromosomes. Females have paired XX chromosomes, males have XY chromosomes.

The orange gene is only carried on the X chromosome.

Because a male cat only has one X chromosome, if he inherits an orange gene it will change all his black or otherwise dark coloring (his Points, in a Siamese cat's case) to a shade of ginger. So a male cat only needs to inherit one orange gene in order to give him red, apricot or cream Points.

A female cat, on the other hand, having two X chromosomes, needs to inherit orange genes on both chromosomes in order to give her totally red or apricot or cream Points.

Seal Tortie Point Siamese cat

Seal Tortie Point Siamese cat
photo: © Kamée | Creative Commons

The cause of the tortoiseshell effect

If a female cat inherits the orange gene on only one of her chromosomes, it will only change half her pigment to one of the red shades. The other half will remain as it would have been without the orange gene.

So the Siamese tortoiseshell cat comes about because half of points turn to red; in the case of Seal, Chocolate or Cinnamon Points, to red; Blue and Fawn Points to cream, and Caramel Points to apricot.

This also explains why tortoiseshell cats are almost always female – a tortoiseshell male cat would be very, very rare – and a genetic abnormality.





The different colors of Tortie Point

There are seven different varieties of Tortie Point Siamese cat. Their colors are described by the Governing Council of the Cat Fancy as follows:

Seal Tortie
Points: Seal brown with shades of red
Body: Cream. In kittens the body colour may be muddy fawn

Blue Tortie
Points: Light blue with shades of cool toned cream
Body: Glacial white

Chocolate Tortie
Points: Milk chocolate with shades of red
Body: Ivory

Lilac Tortie
Points: Pinkish grey with shades of cool toned cream
Body: Off-white (magnolia)

Cinnamon Tortie
Points: Warm cinnamon brown with shades of red
Body: Ivory

Caramel Tortie
Points: Brownish grey with shades of apricot
Body: Off-white (magnolia)

Fawn Tortie
Points: Warm pale rosy mushroom with shades of cream
Body: Off-white (magnolia)

So now you know!

And the next time you see a Siamese Tortie Point cat, you'll be able to impress your friends with your new-found knowledge, both of cats, and genetics!

Seal Tortie Point Siamese cat, close-up

Seal Tortie
photo: © Kamée | Creative Commons



Read on! Related red color point pages:


***************

Or go to:

Top of Tortie Point Siamese Cat

Siamese Cat Colors - An Overview

Life with Siamese Cats Home Page


***************


Stories and questions about Tortie Points

Find out more about Tortie Points in these questions and stories from our readers:

My Chocolate Tortie Point Siamese, Yoshi Princess, And Her 'Brothers' 
I have a Chocolate Tortie Point Siamese cat. I adopted Yoshi Princess on December 26th 2010 from a lady not too far from me. I really lucked out …


***************


Enjoy this? Don't miss out -
sign up for our free newsletter,
Meezer Musings

Our monthly stroll through items of interest,
news and stories, photos, tips, and our
Meezer of the Month!

Enter Your E-mail Address
Enter Your First Name (optional)
Then

Don't worry — your e-mail address is totally secure.
I promise to use it only to send you Meezer Musings.


***************


Like us? Please share us with
your Siamese-loving friends



Information provided on this website is not intended to replace professional advice. If you have any concerns about your cat's health, please consult a veterinarian.

Copyright © 2009-2014 Caroline Haines, Life-with-Siamese-Cats.com. All rights reserved.


The Siamese Colors


Seal point Siamese cat


Seal




Chocolate point Siamese cat


Chocolate




Blue point Siamese cat


Blue




Lilac point Siamese cat


Lilac




Lynx point Siamese cat


Lynx/Tabby




Flame point Siamese cat


Flame/Red




Tortie point Siamese cat


Tortie