Differentiation of the Primitive Sex Elements at the Expense of the Y or W, and the Conservation of the Original X or Z

  • Susumu Ohno
Part of the Monographs on Endocrinology book series (ENDOCRINOLOGY, volume 1)

Abstract

In the previous chapter it was shown that, with the exception of a small number of hermaphroditic species of fishes, the chromosomal sex-determining mechanism does exist in lower vertebrates. However, the X and the Y or the Z and the W of fishes and amphibians are still in an initial stage of differentiation. The two opposing sex determiners are still almost entirely homologous to each other.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1966

Authors and Affiliations

  • Susumu Ohno
    • 1
  1. 1.Department of BiologyCity of Hope Medical CenterDuarteUSA

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