FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term primary spermatocyte ID (Ontology) FBbt:00005286 (Fly Anatomy)
Definition Male germ cells of the 16-cell cyst from the end of the S-phase that precedes meiosis I to the end of meiosis I. This S-phase occurs very early in the 16-cell cyst stage so almost all 16 cell cysts are at the primary spermatocyte stage.[ FlyBase:FBrf0064778 ]
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Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      35
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION      14
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       9
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      11
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes  Insertions Constructs
 primary spermatocyte (all annotations which use CV term, excluding "NOT" statements)      35     82      4     23     26
     primary spermatocyte | ectopic       2       --       --       --       3
     primary spermatocyte | male       2       --       --       --       --
     primary spermatocyte | P-stage       1       --       --       1       --
     primary spermatocyte | spermatogenesis       3       --       --       1      2
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  male germline cell
   |__spermatocyte
       |__primary spermatocyte  191 rec.
           |__apolar primary spermatocyte
           |__mature primary spermatocyte 7 rec.
           |__meiotic primary spermatocyte 12 rec.
           |   |__primary spermatocyte in meiotic anaphase I 4 rec.
           |   |__primary spermatocyte in meiotic metaphase I
           |   |__primary spermatocyte in meiotic prophase I 4 rec.
           |   |__primary spermatocyte in meiotic telophase I 3 rec.
           |__polar primary spermatocyte 18 rec.
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Is a spermatocyte
Part of primary spermatocyte cyst
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