Siamese Cat

　　Some breeding rules about purebred cats are important references for cat breeders, and Siamese cats are no exception. Of course, special cases are not excluded, but the following rules are general principles.

　　When mentioning the color group -- it refers to (blue, black, cream, red, etc.); when mentioning the pattern group -- it refers to (tabby, smoke, shading, etc.). If both act together, then the following rules will combine color/pattern.

　　1. Male kittens will inherit two color genes from the mother cat, while male cats' offspring will inherit the mother's color (if the mother is multicolored, then one of the colors) or will dilute the male cat's color --- please also see rules 21 and 24 for explanation.

　　2. Female kittens inherit one color gene each from both parents; the mother's offspring will mix or dilute the colors of the parents --- please also see rules 21 and 24.

　　3. To get cream or red (color/pattern) female kittens, the male cat must be cream or red (color/pattern), and the mother cat must also be red or cream --- please see rule 21.

　　4. Only the direct parents' color/pattern of a kitten can appear on that kitten. Colors/patterns of ancestors appearing on pedigree documents do not always directly affect the kitten. A notable exception is the pointed color gene, which can be carried by multiple descendants and show up --- please see rules 21 & 24.

　　5. The kitten's patterns can come from either the father or the mother cat.

　　6. Some main features (main colors and patterns, such as: smoke, shading, white, tabby, bicolor, etc.) do not skip generations. These features do not affect the next generation without appearing first.

　　7. Cats expressing dominant colors (black, red, tortoiseshell, etc.) must have a father or mother showing those colors --- please see rule 21.

　　8. Two recessive color parents (cream, blue, etc.) will not produce kittens with dominant colors (black, red, etc.).

　　9. Two pointed color parents will not produce kittens without pointed color.

　　10. To get pointed kittens, both parents must carry the pointed color gene (even if it does not manifest).

　　11. Mating a pointed cat with a cat without pointed color ancestry will produce kittens without visible pointed color.

　　12. A (non-silver) tabby cat must have one parent with shading or tabby. A silver tabby cat must have one parent that is silver tabby, shading, or smoke --- please see rule 13.

　　13. All red cats must have tabby markings. To be considered "red tabby" depends on whether the parents show tabby markings or have shading. A red tabby cat that is not a true tabby cannot produce true red tabby kittens unless mated with a cat showing dominant tabby or shading colors.

　　14. A cat with white undercoat hair (smoke or shading) must have one parent with white undercoat --- please see rule 21.

　　15. A shading color cat must have one parent with shading color --- please see rule 21.

　　16. A shading cat can produce smoke offspring, but a non-shading (smoke) cat cannot produce shading offspring unless mated with a shading cat --- please see rule 21.

　　17. Bicolor cats must have one parent that is also bicolor --- please see rule 21.

　　18. Multicolored cats (blue cream, tortoiseshell, calico) are mostly female, but male cats occasionally occur (and they are not always infertile).

　　19. For white cats, one parent must be white.

　　20. When a white cat mates with another white cat (visible white) or a cat marked as white (not visibly white), they can produce white or marked colors/patterns. Marked colors/pattern cats must be dominant but have a white coat lineage. Their offspring can produce expected colors/patterns through planned breeding.

　　21. Genetically, solid white cats can influence the expected kitten colors/patterns, and such kittens will be marked with color/pattern.

　　22. Two long-haired parents will not produce short-haired offspring.

　　23. Two classic tabby parents will not produce kittens with fishbone, spotted, or tipped tabby patterns. A tipped tabby cat must have a parent that is also tipped tabby. A fishbone or spotted tabby cat must have a parent with fishbone or spotted tabby --- please see rule 21.

　　24. Dilution genes must appear in both parents' pedigrees to produce diluted color coats.

　　25. Chocolate and lilac genes must both appear simultaneously in the parents' pedigree to produce chocolate or lilac cats. (Source：PetsZone)