HELP WITH SCIENCE PUNNETT SQUARE HOMEWORK?

The gene that codes for black fur in guinea pigs has two alleles. Two recessive copies of this allele will result in a guinea pig that can�t produce black fur, it will have white fur. Construct a punnett square to show all possible genotypes that could result from a cross of an heterozygous black guinea pig with a white guinea pig. Write the phenotypes in F1