Just because the colors and marking are different does not make the kitten a different breed. If the mother and the father are Persian cats then the kittens will always be Persain kittens, even if they are black, white or calico. Calico is not a breed, it's a color pattern.

Just remember the color of a cat or kitten is not it's breed. The color of a kitten is determined by genes. It's one of those wonders of the world - cats can have different colored kittens.

I hope this helped some. Maybe someone else can explain it to you better.

Edit: I just saw Aly's post - she's right, researching it online will probably help.