How do I work out the answer to Question B - cats & genetics?

In cats, short hair is dominant over long hair and is autosomal. Allele B1 of a linked gene produced ginger coat colour and allele B2 produces black. The heterozygote B1B2 produces a tortoiseshell and calico coat. a) if a long haired black tom is mated with a tortoiseshell queen zygous for short hair, what kind of kittens will be produce in the F1 (Answer: XB2Yss x XB1XB2SS) AND b) if the F1 cats are allowed to breed freely, which matings have the potential to produce a long haired ginger tom? HELP!