FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

pronucleus

ID (Ontology)

GO:0045120 (Gene Ontology)

Definition

The nucleus of either the ovum or the spermatozoon following fertilization. Thus, in the fertilized ovum, there are two pronuclei, one originating from the ovum, the other from the spermatozoon that brought about fertilization; they approach each other, but do not fuse until just before the first cleavage, when each pronucleus loses its membrane to release its contents.[ ISBN:0198506732 ]

Comment

Links to External Ontologies

QuickGO data AmiGO data

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)	PHENOTYPE_MANIFEST_IN

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	Constructs
pronucleus (all annotations which use CV term, excluding "NOT" statements)		--
pronucleus \| maternal effect

Spanning Tree (Parents/Children)

  intracellular membrane-bounded organelle
   |__nucleus
       |__pronucleus  33 rec.
           |__female pronucleus 17 rec.
           |__male pronucleus 18 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	nucleus
Part of
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts
	Wikipedia:Pronucleus