k Tortoiseshell kitten Tortoiseshell kitten Felis catus. Tortoiseshell or calico coat colouration occurs in female cats which simultaneously express both the dominant Orange gene, XO and its recessive form Xo. These are present at the same location on the X chromosome. For this reason only male cats which have an extra X chromosome can be tortoiseshell. Stock Photo - Afloimages
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Tortoiseshell kitten Tortoiseshell kitten  Felis catus . Tortoiseshell  or calico  coat colouration occurs in female cats which simultaneously express both the dominant Orange gene, XO and its recessive form Xo. These are present at the same location on the X chromosome. For this reason only male cats which have an extra X chromosome can be tortoiseshell.
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Tortoiseshell kitten

Tortoiseshell kitten (Felis catus). Tortoiseshell (or calico) coat colouration occurs in female cats which simultaneously express both the dominant Orange gene, XO and its recessive form Xo. These are present at the same location on the X chromosome. For this reason only male cats which have an extra X chromosome can be tortoiseshell.

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