Gonads and Ducts of Vertebrates (With Diagram) | Chordata | Zoology
Gonads are cytogenic sex glands. They are paired testes in males and ovaries in females because all vertebrates are dioecious with the exception of the hermaphrodite cyclostomes and some bony fishes. In hagfishes the anterior part of gonad produces ova and the posterior part sperm. In any one individual, however, the gonad at maturity functions only as an ovary or [...]