Read e-book online Acquiring Genomes. A Theory of the Origin of Species PDF

By Lynn Margulis

ISBN-10: 0786722606

ISBN-13: 9780786722600

From one of many nice iconoclasts of contemporary biology, Lynn Margulis, a groundbreaking new idea of the origins of species

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Additional resources for Acquiring Genomes. A Theory of the Origin of Species

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The unsuited offspring die—they tend to be called “unfit” — with fitness, a technical term, referring to the relative numbers of offspring left by an individual to the next generation. The most fit, by definition, produce the largest number of offspring. The mutant variations then leave more offspring, and populations evolve; that is, they change through time. When the number of changes in the offspring accumulate to recognizable proportions, in geographically isolated populations, new species gradually emerge.

Since no bacterium (whether eubacterium or archaebacterium) evolved from symbiotic integration of formerly independent cells, bacteria lack species; the process of speciation began with the earliest eukaryotes (the first protists, or organisms with nuclei). The concept that all bacteria are interfertile (they can transfer their genes from one to another no matter how different are the recombining partners) has been well argued for over thirty years and is newly explained in Prokaryotology, by Sonea and Matthieu, 2000.

Conirostris, is probably so called because of its massive coneshaped bill suited to cracking large cactus seeds. The common name of G. conirostris is too close for comfort to the just-plain cactus finch G. scandens. The other seven species divide into three groups: those who live in the trees on fruits and insects; strict vegetarians of the trees; and tree-dwellers who embody “convergent evolution”—they sing, act, and feed so much like warblers that they were at first taken to be warblers. Since 1978, the Grants have camped on Genovese Island, by a sharkless, leechless lagoon named after Darwin.

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Acquiring Genomes. A Theory of the Origin of Species by Lynn Margulis

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