Also found in: Medical.
Related to multiple allele: codominance
Any of a set of three or more alleles, or alternative states of a gene, only two of which can be present in a diploid organism.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.