FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

antimorphic allele - genetic evidence

ID (Ontology)

FBcv:0000292 (FlyBase CV)

Definition

An allele that is inferred to make a gene product that is antagonistic to the wild-type gene product from the observations that extra copies of the wild-type allele reduce the expressivity and/or penetrance of the phenotype. So, the phenotype over a deficiency is stronger than that over a wild-type allele, which in turn is stronger than that in the presence of a duplication of the wild-type locus. This test is similar to that used for hypomorphic alleles. An antimorph can be distinguished from a dominant hypermorph as only the former can be reverted to wild-type by deletion of the mutant allele.[ FlyBase:FBrf0002371 FlyBase:FBrf0049147 ]

Comment

Links to External Ontologies

Annotations

Records annotated with this term OR any of its CHILD TERMS

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Direct annotations: records annotated with this exact term (child terms are NOT included)

Data Class	Field	Direct annotations
Alleles (FBal)	ALLELE_CLASS
Alleles (FBal)	PROMOTED_CLASS

Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records

Full annotation statements	Relevant FlyBase reports
Full annotation statements	Alleles
antimorphic allele - genetic evidence (all annotations which use CV term, excluding "NOT" statements)

Spanning Tree (Parents/Children)

  gain of function allele
   |__antimorphic allele
       |__antimorphic allele - genetic evidence  256 rec.
           |__temperature conditional antimorphic allele - genetic evidence 5 rec.
               |__cold sensitive antimorphic allele - genetic evidence 3 rec.
               |__heat sensitive antimorphic allele - genetic evidence 2 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	antimorphic allele
Part of
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts