Thanks so much, VermontCat!! that website is awesome!! It's bookmarked and one I will have to get back to!

I found the answer to my question:

"Can you get yellow Labradors from black ones? And vice versa? What about chocolates?

Yes, you can get yellows from blacks and blacks from yellows. Similarly, you can get chocolates from blacks or yellows and vice-versa. It all depends on what color genes the parents carry. The only absolutes are that if both parents are yellow, the resulting puppies are always yellow, never black or chocolate; if both parents are chocolate, you can get yellow or chocolate puppies but never black ones."

They also go on into depth (which I found fascinating--I always liked genetics in Bio. class) but wasn't sure if it would be of general interest so didn't quote it.

Thanks again!