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).
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References
Baltzer, F.: Experiments on sex development in Bonellia. The Collecting Net 10, 3–8 (1935).
Lederberg, J.: Bacterial reproduction. Harvey Lectures Ser. 52, 69–82 (1959).
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© 1966 Springer-Verlag Berlin · Heidelberg
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Ohno, S. (1966). Introduction. In: Sex Chromosomes and Sex-Linked Genes. Monographs on Endocrinology, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88178-7_1
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DOI: https://doi.org/10.1007/978-3-642-88178-7_1
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