The vast majority of domestic cats do not belong to any particular breed. Breeds of cats are created by humans, by selective breeding. Most breeds were invented in the 20th century. The only way to know if a cat belongs to a particular breed is by looking at its pedigree.
Breeds of cats are not like species of birds--you can't identify a breed by looking at a chart of pictures or a field identification handbook. In particular, the color and markings are not definitive. Many of the physical characteristics that distinguish cat breeds are related to conformation, rather than markings: head shape, eye shape, ear set, body length, and so on.
If your cat doesn't have a pedigree, it is not a member of a specific breed. That's ok--a pedigree is of no value to the cat, anyway.
Yes, the Burmese cat breed is closely related to the Burmilla cat breed.
Yes, the Ragdoll cat breed is a very large cat breed.
No, the American Shorthair cat breed isn't closely related to the American Bobtail cat breed.
Yes, the American Curl cat breed is closely related to the American Bobtail cat breed.
A white cat can be of any breed. It is simply a white cat.
Yes, the Singapura is a breed of cat. The cat is one of the smallest breed of cat.
There is no best cat breed, as it depends on your opinion.
The most famous breed of hairless cat is the Sphinx.
Domestic cats come in a variety of colors and sizes. The world's biggest cat breed is the Maine Coon and the world's smallest cat breed is the Singapura.
Yes, the Sphynx cat breed is a very popular breed in America.
a kind of cat is a "breed" of cat
Yes, the Scottish Fold is a breed of cat. The cat is known for its ear fold.