Dihybrid Crosses

In a dihybrid cross, two traits are studied at one time.

Example:
A female guinea pig heterozygous for both fur color and coat texture is crossed with a male that has light fur color and is heterozygous for coat texture. Dark fur color is dominant (D) and light fur (d) is recessive. Rough coat texture (R) is dominant while smooth coat (r) is recessive. Find the possible genotypes of the offspring.

Image by Chernobyl Frog Dissections