FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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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 ]
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Data Class Field Records
Alleles (FBal)  ALLELE_CLASS       3
Alleles (FBal)  PROMOTED_CLASS       2
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 heat sensitive amorphic allele - genetic evidence (all annotations which use CV term, excluding "NOT" statements)       3
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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.
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Is a heat sensitive amorphic allele
temperature conditional amorphic allele - genetic evidence
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