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Science 24 October 1975:
Vol. 190. no. 4212, pp. 382 - 383
DOI: 10.1126/science.1179215
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Articles

Science, Vol 190, Issue 4212, 382-383
Copyright © 1975 by American Association for the Advancement of Science

articles

Clades versus clones in evolution: why we have sex

SM Stanley

Sexual reproduction predominates among organisms mainly because most evolutionary change is concentrated in speciation events, and asexual species cannot speciate in the normal sense. Asexual clones seldom diversify rapidly enough to overcome normal rates of extinction. In contrast, phylogenetic groups of sexual species (clades) commonly develop broad, heterogeneous adaptive zones rapidly enough to ensure survival.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Bangiomorpha pubescens n. gen., n. sp.: implications for the evolution of sex, multicellularity, and the Mesoproterozoic/Neoproterozoic radiation of eukaryotes.
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Darwinism and the expansion of evolutionary theory.
S. Gould (1982)
Science 216, 380-387
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Coexistence of Clones in a Heterogeneous Environment.
R. C. VRIJENHOEK (1978)
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Biogeography of Free-Living Soil Nematodes from the Perspective of Plate Tectonics.
V. R. Ferris, V. R. FERRIS, C. G. GOSECO, and J. M. FERRIS (1976)
Science 193, 508-510
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Stability of Species in Geologic Time.
S. M. Stanley and S. M. STANLEY (1976)
Science 192, 267-269
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