two genes control color in corn snakes as follows: o– b– snakes are brown, o– bb are orange, oo b– are black, and oo bb are albino. a brown snake was mated to an albino snake, and a large number of f1 progeny were obtained, all of which were brown. when the f1 snakes were mated to one another, they produced 100 brown offspring, 25 orange, 22 black, and 13 albino.