Polyphyletic Evolution of Vertebrates

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


Thus far we have seen that, during the course of sex chromosome differentiation, the one which was elected to accumulate factors governing the development of the homogametic sex was conserved in its entirety. The differentiation was accomplished exclusively at the expense of the element which was elected to be the determiner of the heterogametic sex, the Y or the W.


Placental Mammal Diploid Chromosome Number Diploid Nucleus Desert Tortoise Regional Duplication 
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Copyright information

© Springer-Verlag Berlin · Heidelberg 1966

Authors and Affiliations

  • Susumu Ohno
    • 1
  1. 1.Department of BiologyCity of Hope MedicalDuarteUSA

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