This free-and-easy arrangement produced strong, healthy kittens that flourished because of the division of labour of the mother cats.

Few of these males can breed (1 in 3,000) and are rejected by breeders for studding purposes and would, in any event, pass on only one of those X chromosomes to any male offspring, producing normal (non-calico) male kittens.

After she recovered, her next litter produced exceptionally friendly kittens.

After Josephine recovered, her next litter produced kittens with similar temperament.

Descendants of these cats occasionally produced kittens with long or fuzzy coats, and in 1963, Mary Mailing, a breeder from Canada, entered one into a local pet show.

Tonga was neutered and sold as a pet, but further breedings of his parents produced more spotted kittens, and became the basis of a separate Ocicat breeding program.

Because the gene is so dominant and "invades" other breeds when crossed (often without owner knowledge) with the Manx, some have believed that simply being in the proximity of a Manx cat could cause other breeds to somehow produce tailless kittens.

When two Exotic Shorthairs are crossed, they may produce longhaired kittens called "Exotic Longhairs" by the C.F.A. but considered Persian by other registering bodies.

Wong Mau was then bred with her son to produce dark brown kittens that were called Burmese cats.

Test-matings to Devon Rex produced only straight-haired kittens.