One True-Breeding Line of Mice Is Obese and Dark, and the Other

Multiple Choice

One true-breeding line of mice is obese and dark, and the other true-breeding line is lean and light.Dark is dominant to light, but obese and lean exhibit incomplete dominance.The two genes involved are on separate chromosomes.What proportion of offspring from a dihybrid cross should be dark and be intermediate between obese and lean?

A) 1/16
B) 3/16
C) 1/4
D) 3/8
E) 9/16