How do new species evolve? Although Darwin identified inherited
variation as the creative force in evolution, he never formally
speculated where it comes from. His successors thought that new
species arise from the gradual accumulation of random mutations of
DNA. But despite its acceptance in every major textbook, there is
no documented instance of it. Lynn Margulis and Dorion Sagan take a
radically new approach to this question. They show that speciation
events are not, in fact, rare or hard to observe. Genomes are
acquired by infection, by feeding, and by other ecological
associations, and then inherited. "Acquiring Genomes" is the first
work to integrate and analyze the overwhelming mass of evidence for
the role of bacterial and other symbioses in the creation of plant
and animal diversity. It provides the most powerful explanation of
speciation yet given.
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