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A

allele

1) One of a number of alternative forms of a gene. Commonly only two alternative forms exist for a gene.
(Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206) 

2) Either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character

antibody

 1 Any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response

asexual reproduction

1 Reproduction without the fusion of gametes