Genes are contained within the chromosome which is made up of a double-strand helix containing DNA. If an X sperm fertilises the egg, the offspring will be female (XX), if a Y sperm fertilises the egg, the offspring will be male (XY). All of the female cat’s eggs are X, whereas the male sperm can be X or Y. 18 of the chromosomes are autosomes, and one pair is the sex chromosomes X and Y. Basic cat geneticsĬats have 19 chromosomes which come in pairs, one from the mother and one from the father. The basic wild-type tabby is a mackerel ( T m) however, two mutations have arisen, the dominant ticked tabby ( T a) and the recessive classic tabby ( t b). Some young cats with solid coat colours will display faint ghost tabby markings until their fur becomes fully pigmented. Even cats with no tabby stripes have tabby genes but do not show the pattern on the fur. All domestic cats were once tabby, mutations lead to some cats appearing solid, bi-colour or pointed. Tabby patterns are common in random-bred cats as well as many pure breeds.
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