. Principles of modern biology. Biology. Natural Selection; Origin of Species - 543 that among colon bacilli (Escherichia coli) a mutation that makes the bacterium resist- ant to the sterilizing effects of streptomycin occurs, on the average, in 1 out of every 1,000,000 individuals. In an ordinary en- vironment such resistant mutants have no survival advantage and consequently they re- main in circulation only as an insignificant minority (Fig. 28-4). When, however, strepto- mycin is introduced into the environment, the resistant mutant becomes dominant—to the virtual exclusion of the original
. Principles of modern biology. Biology. Natural Selection; Origin of Species - 543 that among colon bacilli (Escherichia coli) a mutation that makes the bacterium resist- ant to the sterilizing effects of streptomycin occurs, on the average, in 1 out of every 1,000,000 individuals. In an ordinary en- vironment such resistant mutants have no survival advantage and consequently they re- main in circulation only as an insignificant minority (Fig. 28-4). When, however, strepto- mycin is introduced into the environment, the resistant mutant becomes dominant—to the virtual exclusion of the original nonre- sistant form (Fig. 28-4). In fact, the appear- ance of mutant forms of various bacteria that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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