Reproductive organ that produces and releases eggs (ovary) or sperm (testis).
Comment:
[homology-note] "Examination of different vertebrate species shows that the adult gonad is remarkably similar in its morphology across different phylogenetic classes. Surprisingly, however, the cellular and molecular programs employed to create similar organs are not evolutionarily conserved.[uncertain][VHOG]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0000397", ontology="VHOG", source="DOI:10.1146/annurev.cellbio.042308.13350 DeFalco T, Capel B, Gonad morphogenesis in vertebrates: divergent means to a convergent end. Annual review of cell and developmental biology (2009)", source="http://bgee.unil.ch/"}