Determine the phenotypes of the offspring shown in the Punnett square.

BB:
Bb:
bb:

BB you have a 25% chance of a homozygous rat
Bb you have a 50% chance of a heterozygous rat
bb you have a 25% chance of a homozygous rat
In the picture, the alleles are the same for both female and male rats so you could have any of the following depending on the genotype & phenotype.

The answer would be sand and gravel