Here's an excellent website that tells you how to dehybridize( make selections) and describes what's called gene segregation in that process and tells you roughly how long it will take to get to the OP state.
I've sent a lot of folks there to learn how to hybridize, dehybridize, etc, and there's a lso lots of useful links.
The author and owner of the website is someone that many of us know.
http://www.kdcomm.net/~tomato/