If a homozygous dominant male black hamster is crossed with a homozygous recessive female white hamster, (using b for black and b for white). what is the genotype of each parent?

Homozygous means they have two of the same allele

Dominant means it will be symbolized using capitals

Recessive means it will be symbolized using lower case

So your final answer would be:

Dominant male black hamster = BB

Recessive female white hamster = bb