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Gonad
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== Evolution == {{Main|Evolution of sexual reproduction}} It is hard to find a common origin for gonads, but gonads most likely [[evolved independently]] several times.<ref>{{Cite book|last=Schmidt-Rhaesa|first=Andreas |chapter=13. Reproductive organs |chapter-url={{GBurl|iiwTDAAAQBAJ|p=252}} |title=The Evolution of Organ Systems|date=2007-08-30|publisher=Oxford University Press|isbn=978-0-19-856668-7 |oclc=190852859 |pages=252 |quote=The diversity of modes in which gonads are formed makes it hard to substantiate a common origin of gonads. It appears to be more likely that gonads evolved independantly several times.}}</ref>
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