Acquiring Genomes: A Theory Of The Origins Of Species

Lynn Margulis, Distinguished University Professor in the Department of Geosciences, University of Massachusetts, Amherst, is a member of the National Academy of Sciences and a recipient of the 1999 Presidential Medal of Science. She lives in Amherst, Massachusetts. Dorion Sagan is the author of Biospheres and, with Dr. Eric Schneider, Into the Cool: The New Thermodynamics of Life. He lives in New York City.

A challenger of the orthodox "neo-Darwinist" interpretation of evolution, microbiologist Margulis has made her professional mark touting an alternative: symbiogenesis. She and coauthor (and son) Sagan have presented their ideas in earlier popular works (What Is Life?, 1995), but never as vigorously as in this volume. Essentially, the debate between neo-Darwinists and Margulis hinges on the definition of a species, and the manner in which a new one appears. To Margulis and Sagan, the neo-Darwinist model, which asserts random gene mutation as the source of inherited variations, is "wildly overemphasized," and to support their view, they delve deeply into the world of microbes. They detail the anatomy of cells with and without nuclei, positing a process of genome ingestion that creates a new species. Surprisingly, the upshot of Margulis' theories is the rehabilitation of Jean Baptiste de Lamarck, whose theory that supposedly acquired traits are hereditary has been ridiculed for 150 years. Polemical and provocative, Margulis and Sagan's work should set many to thinking that evolution has not yet been completely figured out. Gilbert Taylor
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