What is the difference between homozygous and heterozygous allele combinations?

• A. Homozygous means no alleles; heterozygous means one allele.
• B. Homozygous means two different alleles; heterozygous means two identical alleles.
• C. Homozygous means two identical alleles; heterozygous means two different alleles.
• D. Homozygous means dominant alleles; heterozygous means recessive alleles.

Answer: (C)