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Are All Orange Cats Male?

Are all orange cats male?

Are orange cats male?No, although they are far more common than female orange cats. All cats have two "sex" chromosomes. Either XX (female) or XY (male). All female eggs carry the X chromosome, and male sperm may be either X or Y. If an egg is fertilised by a sperm carrying the X chromosome, it will develop into a female, if it is fertilised by a sperm carrying the Y chromosome, it will develop into a male.

So:

Male - XY

Female - XX

O (orange) gene:

The gene for orange (O) is carried on the X chromosome, making it sex linked. The O gene is dominant, o (non-orange) being recessive. Therefore, if the male has the O gene on the X chromosome, he will be red. 

  • Oo (red)
  • oo (non-red).

The female has two X chromosomes. One can carry the O gene, one can carry o (non-orange). If this occurs, the female will be calico (red & black or brown). However, if both chromosomes carry the O gene, she will be red. So, she may be

  • OO (red)
  • Oo (calico)
  • oo (non-red).

Red males outnumber red females by approximately 3 to 1.

Also see:

Black cats   Tuxedo cats   White cats  Calico cats