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Introduction

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

Abstract

Natural selection operates among individual organisms which differ in their genetic constitution. The degree of hereditary variability within a species is greatly enhanced by cross-fertilization. Indeed, the mechanism of sexual reproduction occurred very early in evolution, for it is seen today even in bacteria. In Escherichia coli, fertilization occurs by passage of the single chromosome from the male into the female bacterium (Lederberg, 1959).

Keywords

Placental Mammal Mendelian Gene Female Heterogamety Genome Lineage Hemizygous State 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Baltzer, F.: Experiments on sex development in Bonellia. The Collecting Net 10, 3–8 (1935).Google Scholar
  2. Lederberg, J.: Bacterial reproduction. Harvey Lectures Ser. 52, 69–82 (1959).Google Scholar

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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