FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

amorphic allele

ID (Ontology)

FBcv:0000688 (FlyBase CV)

Definition

An allele that completely lacks function, coding either for a completely inactive gene product or none at all.[ 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
amorphic allele (all annotations which use CV term, excluding "NOT" statements)

Spanning Tree (Parents/Children)

  allele class
   |__loss of function allele
       |__amorphic allele  4323 rec.
           |__amorphic allele - genetic evidence 2019 rec.
           |   |__temperature conditional amorphic allele - genetic evidence(+) 6 rec.
           |__amorphic allele - molecular evidence 2399 rec.
           |   |__temperature conditional amorphic allele - molecular evidence(+) 2 rec.
           |__temperature conditional amorphic allele 8 rec.
               |__cold sensitive amorphic allele(+) 1 rec.
               |__heat sensitive amorphic allele(+) 5 rec.
               |__temperature conditional amorphic allele - genetic evidence(+) 6 rec.
               |__temperature conditional amorphic allele - molecular evidence(+) 2 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	loss of function allele
Part of
Synonyms & Secondary IDs
Synonyms
	"amorph" RELATED "null" RELATED
Secondary IDs

External Crossreferences & Linkouts