In both cattle and in pigs black hair color is completely dominant to red hair color. Consider the following mating scenarios:
A black bull was bred to eight black cows, each of which were daughters of a known heterozygous bull. Eight black calves were produced as a result (each cow had one black calf).
A black boar was bred to a single black sow who was a daughter of a known heterozygous boar. A single litter of eight black pigs were produced. The sow had eight black pigs.
Which statement below provides the BEST interpretation of these results?