posted by Trent .
I'm a bit confused as to whether or not this would be an example of epistasis and how to trace the pedigree to find out which it the dominant trait. My TA hasn't posted a key to this practice question so I was hoping someone could explain it to me!
When true-breeding long-haired, black-eyed guinea pigs are mated with shorthaired, pink-eyed guinea pigs the progeny all have medium length hair and black-eyes. When the F1 progeny are mated back to the shorthaired, pink-eyed parents, what progeny would be expected?