FB2026_03 , released September 17, 2026

CV Term Report

Help Close All Open All

General Information

Term

heat sensitive amorphic allele - genetic evidence

ID (Ontology)

FBcv:0000741 (FlyBase CV)

Definition

An allele inferred to completely lack function at high temperatures (restrictive temperatures) but not at low temperatures (permissive temperatures) from the observation that adding extra copies in the genome has no effect on the phenotype at the restrictive temperatures. Most commonly, evidence takes the form of the observation that the phenotype of homozygotes (2 copies) is identical to that seen when the allele is in trans to a deletion of the gene (1 copy).[ FlyBase:FBrf0002371 FlyBase:FBrf0049147 ]

Comment

Links to External Ontologies

Annotations

Records annotated with this term OR any of its CHILD TERMS

Choose a record type to view annotations for this term and its child terms. Direct annotations and full annotation statements below also provide HitList buttons.

Results list data from multiple species. Choose a record type above to open its HitList.

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
heat sensitive amorphic allele - genetic evidence (all annotations which use CV term, excluding "NOT" statements)

Spanning Tree (Parents/Children)

amorphic allele - genetic evidence
 |__temperature conditional amorphic allele - genetic evidence__
temperature conditional amorphic allele                         |
 |__heat sensitive amorphic allele______________________________|
 |__temperature conditional amorphic allele - genetic evidence__|
heat sensitive loss of function allele                          |
 |__heat sensitive amorphic allele______________________________|
                                                                heat sensitive amorphic allele - genetic evidence  3 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	heat sensitive amorphic allele temperature conditional amorphic allele - genetic evidence
Part of
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts