Why Are Calico Colored Cats Always Female

Ordinarily male cats have XY sex chromosomes while females have XX. The occurrence of male calico cats is theoretically impossible.

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That said female cats inherit their coat color from their mothers and fathers.

Why are calico colored cats always female. This means that they are almost always females and have cells with two X chromosomes. If a cat has an XX pair she will be female. The mutation that gives male cats a ginger-colored coat and females ginger tortoiseshell or calico coats produced a particularly telling map.

Two X chromosomes are needed for a cat to have that distinctive tri-color coat. 2 The reason for this is based on chromosomes. To start this investigation its important to point out that calico is a color pattern of a cat not a breed.

To start this investigation its important to point out that calico is a color pattern of a cat not a breed. The gene which determines whether the coat will be orange or black or one of the diluted colors lie on the X chromosome. Almost all calico cats are females.

For instance a black male cat mates with an orange female cat they will produce a half-blackhalf-orange offspring or a calico. This is the gene for the orange color Oo and it comes in two variants alleles the orange O and the non-orange o. This is known as Klinefelter syndrome and usually causes sterility.

Calico cats are predominantly female because theyre coloring is related to the X chromosome. This eliminates a breed specific reason for a female majority of calicos. The X chromosomes carry the genes for coat colours.

I did some investigating to find out why calico cats are almost always female. The orange mutant gene is found only on the X or female chromosome. Male calico cats are very rare with only around 1 in 3000 calico cats being male but they do exist.

Therefore female cats inherit their coat colour from both their queens XX and their toms XY. As with humans female cats have paired sex chromosomes XX and male cats have XY sex chromosomes. But why are male calicoes so rare.

For cats its also the X chromosome that determines most of the animals coat color. Ill try not to put you to sleep with a complicated genetics lesson so heres a quick overview. This eliminates a breed specific reason for a female majority of calicos.

What Is A Calico Cat. Because they have two X chromosomes tortoiseshell and therefore calico patterns can be expressed just like in females. For a cat to be a calico it must have two X chromosomes and typically only female cats have two X chromosomes says Dr.

Stephanie Karpf a veterinarian at For Cats Only in West Palm Beach Florida. Like humans female cats have XX chromosomes while male cats have XY chromosomes. Because the genetic determination of coat colors in calico cats is linked to the X chromosome calicos are nearly always female with one color linked to the maternal X chromosome and a second color linked to the paternal X chromosome.

This is a rare condition but it banishes the myth that all tortoiseshell and tricolor cats are females. Check my other channel Biographics. You can get more about these tricolored cats from below.

That extra X chromosome means a female can receive both a black and orange color gene which gives rise to calico and tortoiseshell variations. Why are female cats calico or tortoiseshell in color. Although hard to believe one in three tricolored cats is male and only one in ten is fertile.

This results in piebalding where skin and fur that would normally be pigmented. You may have heard that calico cats are always female but this is a myth. To produce a calico or tortie one of the X chromosomes need to carry the black gene and the other will carry the orange gene.

Thus all calico cats are also tortoiseshell but not all tortoiseshell cats are calico. The trick to the calicos multi-colored coat is that this process happens in each individual cell. In fact any breed of cat can be born with calico fur.

It only takes one X chromosome to make the fur a certain color but because females have two one chromosome overrides the other during development. The tri-color calico or often called tortoiseshell-and-white outside of North America with the presence of white fur happens due to a gene unrelated to the X and Y chromosomes. Although its rarer for purebreds like say Russian Blues.

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