In guinea pigs, black fur color is dominant to white fur color. In the P generation, a
guinea pig with black fur is crossed with a guinea pig with white fur. From this
cross, a total of 15 offspring, all with black fur, are produced. One of the guinea pigs
from the F1 generation is then crossed with a guinea pig with white fur. Which
percentage of the F2 generation is expected to have black fur?
