FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
CV Term Report
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General Information
Term meiosis I ID (Ontology) GO:0007127 (Gene Ontology)
Definition The first meiotic nuclear division in which homologous chromosomes are paired and segregated from each other, producing two haploid daughter nuclei.[ PubMed:9334324 ]
Also Known As "meiosis I nuclear division"
Comment
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Annotations
Records annotated with this term OR any of its CHILD TERMS
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Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      13
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 Full annotation statements 
Relevant FlyBase reports
 Alleles
 meiosis I (all annotations which use CV term, excluding "NOT" statements)      13
     meiosis I | female       2
     meiosis I | male       1
Spanning Tree (Parents/Children)
Only view relationship:
nuclear division
 |__meiotic nuclear division______
meiotic cell cycle process        |
 |__meiosis I cell cycle process  |
 |__meiotic nuclear division______|
                                  meiosis I  85 rec.
                                  meiosis I cell cycle process(+) 136 rec.
                                   |__meiosis I  85 rec.
                                   |   |__achiasmate meiosis I 3 rec.
                                   |   |__dynein-driven meiotic oscillatory nuclear movement
                                   |   |   |__horsetail-astral microtubule organization
                                   |   |__female meiosis I 8 rec.
                                   |   |   |__spindle assembly involved in female meiosis I 5 rec.
                                   |   |__homologous chromosome segregation 21 rec.
                                   |   |   |__chromosome localization to nuclear envelope involved in homologous chromosome segregation(+)
                                   |   |   |__homologous chromosome movement towards spindle pole in meiosis I anaphase
                                   |   |   |__homologous chromosome pairing at meiosis(+) 15 rec.
                                   |   |   |__meiotic centromeric cohesion protection in anaphase I
                                   |   |   |__meiotic metaphase I homologous chromosome alignment(+) 2 rec.
                                   |   |   |__regulation of homologous chromosome segregation(+)
                                   |   |__male meiosis I 11 rec.
                                   |   |   |__spindle assembly involved in male meiosis I 1 rec.
                                   |   |__meiosis I nuclear membrane disassembly
                                   |   |__meiosis I nuclear membrane reassembly
                                   |   |__meiotic sister chromatid arm separation
                                   |   |__reciprocal meiotic recombination 40 rec.
                                   |   |   |__chiasma assembly
                                   |   |   |__double-strand break repair involved in meiotic recombination 2 rec.
                                   |   |   |__meiotic DNA double-strand break formation involved in reciprocal meiotic recombination(+) 1 rec.
                                   |   |   |__meiotic DNA double-strand break processing involved in reciprocal meiotic recombination 2 rec.
                                   |   |   |__meiotic DNA recombinase assembly involved in reciprocal meiotic recombination
                                   |   |   |__meiotic DNA repair synthesis involved in reciprocal meiotic recombination 1 rec.
                                   |   |   |__meiotic joint molecule formation(+)
                                   |   |   |__meiotic mismatch repair involved in reciprocal meiotic recombination 1 rec.
                                   |   |   |__meiotic strand invasion involved in reciprocal meiotic recombination
                                   |   |   |__regulation of meiotic DNA double-strand break formation involved in reciprocal meiotic recombination(+)
                                   |   |   |__regulation of reciprocal meiotic recombination(+)
                                   |   |   |__resolution of meiotic recombination intermediates 10 rec.
                                   |   |__regulation of meiosis I
                                   |       |__negative regulation of meiosis I(+)
                                   |       |__positive regulation of meiosis I
                                   |       |__regulation of meiosis I spindle assembly checkpoint(+)
                                   |__achiasmate meiosis I 3 rec.
                                   |__dynein-driven meiotic oscillatory nuclear movement
                                   |   |__horsetail-astral microtubule organization
                                   |__female meiosis I 8 rec.
                                   |   |__spindle assembly involved in female meiosis I 5 rec.
                                   |__homologous chromosome segregation 21 rec.
                                   |   |__chromosome localization to nuclear envelope involved in homologous chromosome segregation(+)
                                   |   |__homologous chromosome movement towards spindle pole in meiosis I anaphase
                                   |   |__homologous chromosome pairing at meiosis(+) 15 rec.
                                   |   |__meiotic centromeric cohesion protection in anaphase I
                                   |   |__meiotic metaphase I homologous chromosome alignment(+) 2 rec.
                                   |   |__regulation of homologous chromosome segregation(+)
                                   |__male meiosis I 11 rec.
                                   |   |__spindle assembly involved in male meiosis I 1 rec.
                                   |__meiosis I nuclear membrane disassembly
                                   |__meiosis I nuclear membrane reassembly
                                   |__meiotic sister chromatid arm separation
                                   |__reciprocal meiotic recombination 40 rec.
                                   |   |__chiasma assembly
                                   |   |__double-strand break repair involved in meiotic recombination 2 rec.
                                   |   |__meiotic DNA double-strand break formation involved in reciprocal meiotic recombination(+) 1 rec.
                                   |   |__meiotic DNA double-strand break processing involved in reciprocal meiotic recombination 2 rec.
                                   |   |__meiotic DNA recombinase assembly involved in reciprocal meiotic recombination
                                   |   |__meiotic DNA repair synthesis involved in reciprocal meiotic recombination 1 rec.
                                   |   |__meiotic joint molecule formation(+)
                                   |   |__meiotic mismatch repair involved in reciprocal meiotic recombination 1 rec.
                                   |   |__meiotic strand invasion involved in reciprocal meiotic recombination
                                   |   |__regulation of meiotic DNA double-strand break formation involved in reciprocal meiotic recombination(+)
                                   |   |__regulation of reciprocal meiotic recombination(+)
                                   |   |__resolution of meiotic recombination intermediates 10 rec.
                                   |__regulation of meiosis I
                                       |__negative regulation of meiosis I(+)
                                       |__positive regulation of meiosis I
                                       |__regulation of meiosis I spindle assembly checkpoint(+)
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Is a meiosis I cell cycle process
meiotic nuclear division
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Synonyms
  • "meiosis I nuclear division" EXACT
Secondary IDs
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Wikipedia:Meiosis#Meiosis_I