The gene for the black suit in the bull dominates over the gene for the red suit. What offspring

The gene for the black suit in the bull dominates over the gene for the red suit. What offspring will result from crossing a purebred black bull with black cows? What will be the offspring from crossing these hybrids with each other.

There are two options here:

1) If the cow is homozygous for a dominant trait, 100% of the offspring will be black and homozygous for that trait.

2) If the cow is heterozygous, then 100% of the offspring will be black, but 50% will be homozygous for the dominant trait, and 50% will be heterozygous.

If you cross two heterozygotes with each other, the phenotype splitting will be 3: 1 (black to red), and by the genotype 1: 2: 1 (dominant homozygotes to heterozygotes to recessive homozygotes)