Why are the three-gama cats infertile? The three-floral cat is a special breed bred by humans. They are smaller than ordinary cats, but do not have the fertility of ordinary cats because their genes lack certain specific genetic components required...
Why are the three-gama cats infertile? The three-floral cat is a special breed bred by humans. They are smaller than ordinary cats, but do not have the fertility of ordinary cats because their genes lack certain specific genetic components required for fertility.
Cats have eighteen pairs of autosomes and a pair of sex chromosomes. The black and orange genes of our common three-cat cats are located on the X chromosome. Because its background color is white, the two X chromosomes are randomly deactivated in different parts of the cat's body. This is the origin of the three-cat cats (please see Wikipedia's description of "Balsomes", which clearly states the mosaics)
Therefore, if you want to present three colors on your body, a cat must have at least two or more X chromosomes. If the sex chromosome of a male tricolor cat is XXY, or a chimera is formed during development (the two abnormal chimera of fertilized eggs are called one), then the sex chromosome of a male cat will become XX/XY or XY/XY.
No matter which one it is, it is caused by rare chromosomal abnormalities. For example, XXY's male cats not only show some female behavior, but also cannot symmetrically divide and produce normal sperm. Therefore, the number of male tricolor cats is very small, and most of them are infertile.
Generally, three kobas suffer from Kerry's syndrome and have two X chromosomes. The 23rd pair of chromosome abnormalities leads to their genetic map XXY, which is the reason for infertility and small number.
