allelomorph

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A distinct phenotype associated with a specific allele.

from The Century Dictionary.

• noun In biology, one of a pair of mutually exclusive qualities exhibited respectively by each of two pure races or varieties of a species, these qualities being of such a nature that one or the other of the pair is exhibited in perfection, to the complete exclusion of the other, by each cross-bred descendant of the two pure races.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Biol.) One of the pure unit characters commonly existing singly or in pairs in the germ cells of Mendelian hybrids, and exhibited in varying proportion among the organisms themselves; same as allele, 2. Allelomorphs which under certain circumstances are themselves compound are called hypallelomorphs. See mendel's law.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun genetics one of a number of alternative forms of the same gene occupying a given position on a chromosome

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (genetics) 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