Different alleles produce variation in inherited characteristics such as hair and eye color.
Amino acids link together in long chains to form proteins in the body.
Antibodies bind to antigens, often produced by disease, and help the body fight against them. Antibodies can help the body to develop immunity to a disease. A strand of DNA that is not responsible for coding. The antisense strand serves as the template for RNA synthesis. Humans have 22 pairs of autosomes.