part of part of develops_from reproductive system gonad Reproductive organ that produces and releases eggs (ovary) or sperm (testis). UBERON:0000991 FMA xref is a 'general anatomical term' ZFA:0000413 gonadal MESH:D006066 The part of the reproductive system that produces and releases eggs (ovary) or sperm (testis).[TAO] gonads AAO:0000213 VHOG:0000397 BILA:0000123 EMAPA:16857 Anatomical structure which produces gametes as well as certain sex hormones controlled by the pituitary gonadotropins.[AAO] HAO:0000379 BSA:0000079 gonada EMAPA:17383 FMA:18250 XAO:0003146 TAO:0000413 GAID:368 MA:0002420 OpenCyc:Mx4rwQvdiZwpEbGdrcN5Y29ycA uberon UMLS:C0018067 WBbt:0005175 BTO:0000534 FBbt:00004858 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] reproductive organ gonad primordium