The thing with genetics is family history is key in figuring things out. If you get your mice from a pet shop ,like I ended up doing, the best way to find out what is in there backround is through test breeding. Your doe being a resesive yellow brindle tells you that her parents both had the yellow brindle gene unfortunatly you don't know if they only had that gene or if they had a domonat gene with it. Hope I havn't confused you.