it is in the genes, actually the proper term is Tortoise-shell (sometimes written as one word, tortoiseshell ) cats are all females. This is true, it is genetic, some other animals have sharp...
Not always, but MOSTLY, yes. The chances of a male tortishell being born is about.........1 in 100, but tortishells themselves arn't very common, even the girl ones.
Black, brown (chocolate), white, blue (smoky or dark grey), red (orange), white and cream. There are many variations of these basic colours and many different patterns.