Sponsored by allele.
Genes can exist in more than one form.
Each different form of the same gene is called an allele. For example, in the case of seed shape, there is one allele that determines wrinkled seeds and another allele that determines round seeds. An antibody reacts specifically with the antigen that induced its formation and inactivates the antigen. Our bodies fight off an infection by producing antibodies. Any foreign substance, usually a protein, that stimulates the body's immune system to produce antibodies.