FB2026_02 , released June 18, 2026

CV Term Report

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General Information

Term

temperature conditional amorphic allele - genetic evidence

ID (Ontology)

FBcv:0000737 (FlyBase CV)

Definition

An allele inferred to completely lack function at some temperatures (restrictive temperatures) but not others (permissive temperatures) from the observation that addition of 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

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

Spanning Tree (Parents/Children)

amorphic allele
 |__amorphic allele - genetic evidence___________
 |__temperature conditional amorphic allele______|
temperature conditional loss of function allele  |
 |__temperature conditional amorphic allele______|
                                                 temperature conditional amorphic allele - genetic evidence  6 rec.
                                                  |__cold sensitive amorphic allele - genetic evidence 1 rec.
                                                  |__heat sensitive amorphic allele - genetic evidence 3 rec.

Spanning Tree View Settings
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Relationships
Is a	amorphic allele - genetic evidence temperature conditional amorphic allele
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Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts