isoallele

noun
iso·​al·​lele | \ ˌī-(ˌ)sō-ə-ˈlē(ə)l How to pronounce isoallele (audio) \

Medical Definition of isoallele

: either of a pair of alleles each of which produces such a similar result that a special test (as combination with another allelic mutant) is needed to distinguish them