FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term amorphic allele - genetic evidence ID (Ontology) FBcv:0000288 (FlyBase CV)
Definition An allele inferred to completely lack function from the observation that addition of extra copies in the genome has no effect on the phenotype. 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    2012
Alleles (FBal)  PROMOTED_CLASS    1694
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 Alleles
 amorphic allele - genetic evidence (all annotations which use CV term, excluding "NOT" statements)    2012
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  loss of function allele
   |__amorphic allele
       |__amorphic allele - genetic evidence  2018 rec.
           |__temperature conditional amorphic allele - genetic evidence 6 rec.
               |__cold sensitive amorphic allele - genetic evidence 1 rec.
               |__heat sensitive amorphic allele - genetic evidence 3 rec.
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