Tortoiseshell cat

Apr 20, 2026 - 15:22
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Tortoiseshell cat

Reverting possible vandalism by ~2026-24321-65 to version by ~2026-23596-10. Report False Positive? Thanks, ClueBot NG. (4505289) (Bot)

← Previous revision Revision as of 09:51, 20 April 2026
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== Pigmentation ==
== Pigmentation ==
{{Main|Cat coat genetics}}
{{Main|Cat coat genetics}}
Tortoiseshell coats result from an interaction between genetic, developmental, and environmental factors. Coat colours in domestic cats are produced by the interaction of orange-based [[phaeomelanin]] (O) and black-based [[eumelanin]] (B) pigments. Tortoiseshell cats are bicoloured and expresses a combination of both next to each other in their coat. The primary gene for cat coat colour (WHO WROTE BRITISH HERE!!??) coloration (B) produces the brown-toned colours — black, blue, chocolate, lilac, cinnamon, and fawn. This gene can be masked by the co-dominant gene for the orange colour (O), which produces the orange-toned colours — red and cream. The orange gene is located on the [[X chromosome]] and has two [[alleles]]: orange (XO) and non-orange (Xo), that produce the orange phaeomelanin and black eumelanin pigments, respectively. Typically, the alleles are notated as an uppercase '''O''' for orange, or a lowercase '''o''' for non-orange.
Tortoiseshell coats result from an interaction between genetic, developmental, and environmental factors. Coat colours in domestic cats are produced by the interaction of orange-based [[phaeomelanin]] (O) and black-based [[eumelanin]] (B) pigments. Tortoiseshell cats are bicoloured and expresses a combination of both next to each other in their coat. The primary gene for cat coat colour colouration (B) produces the brown-toned colours — black, blue, chocolate, lilac, cinnamon, and fawn. This gene can be masked by the co-dominant gene for the orange colour (O), which produces the orange-toned colours — red and cream. The orange gene is located on the [[X chromosome]] and has two [[alleles]]: orange (XO) and non-orange (Xo), that produce the orange phaeomelanin and black eumelanin pigments, respectively. Typically, the alleles are notated as an uppercase '''O''' for orange, or a lowercase '''o''' for non-orange.


[[File:Dilute_tortoiseshell_feline.jpg|thumb|upright=1|Cat with a blue ("dilute", "grey") tortoiseshell coat]]
[[File:Dilute_tortoiseshell_feline.jpg|thumb|upright=1|Cat with a blue ("dilute", "grey") tortoiseshell coat]]
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