True/False: If a homozygous black bull is mated to a heterozygous black female, all offspring would be black.

• A. False
• B. Depends on allele expression
• C. True
• D. Cannot determine

Answer: (C)

Dominance determines phenotype in this cross. A homozygous black bull has genotype BB, so every sperm carries B. The heterozygous black female is Bb and can contribute either B or b. Offspring receive one allele from each parent, yielding BB or Bb. In both cases, the dominant B allele is present, so the coat color will be black. Therefore, all offspring would be black.