HELP!!! Whats wrong with my mice??

[Kryptonian]

When I used to breed hamsters I had a similiar situation. Not sure if it will be the same in mice. With hamsters there are some colors that were selectively bred badly. Black bears, panda bears, anything with black, (not dark grey or brown, pitch black) is from a recessive gene. This gene is much like albinos and piebalds etc in bps. If the hamster is black then both its genes are black and if 2 black are mated the litter will be 100% black. Then there is the roans. Roans are basically white hamsters with either black or dark cherry red eyes tat look like someone rubbed color on the surface of thier fur. This mutation has something wrong in its genes to the point where there is so little genetic diversity that when you breed 2 roans together you get a deformity. You end up with a litter of albino babies that have no eyes. These hamsters also do not live very long, average life span is 4 months. They are also extremely aggressive. So Kinda like the problem with pearl bps. Maybe there is a color gene in the mice that cuase certain ones to be deformed aswell.
http://www.hamsterific.com/HamsterUn...rsToAvoid.html

http://www.holmdenhillhaven.com/imag.../anastasia.gif