Mutagenesis - Research Article from Macmillan Science Library: Genetics

Robin Cook
This encyclopedia article consists of approximately 6 pages of information about Mutagenesis.
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Noninduced Mutagenic Agents

Environmental agents can influence the mutation rate not only by increasing it, but also by decreasing it. For example, antioxidants, which are found commonly in fruits and vegetables, are thought by many to protect against mutagens that are generated by normal cellular respiration. In addition to protective agents, however, many plants also contain deleterious mutagens known as carcinogens. Many chemical mutagens exist both naturally in the environment and as a result of human activity. Benzo(a)pyrene, for example, is produced by any incomplete burning, whether of tobacco in a cigarette or of wood in forest fires.

Figure 1. First the parental males were treated and mated to females carrying the ClB X chromosome. Second, those female offspring with Bar eyes were mated individually so that only their offspring would be present in the bottle. Third, after the offspring hatched, the bottle was examined for the presence of males. There were no males with the ClB X chromosome because the l gene kills them. So, any bottles with no males represent one lethal mutation on the other X chromosome, which originated in the treated male. Figure 1. First the parental males were treated and mated to females carrying the ClB X chromosome. Second, those female offspring with Bar eyes were mated individually so that only their offspring would be present in the bottle. Third, after the offspring hatched, the bottle was examined for the presence...

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This section contains 1,739 words
(approx. 6 pages at 300 words per page)
Buy the Mutagenesis Encyclopedia Article
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Macmillan Science Library: Genetics
Mutagenesis from Macmillan Science Library: Genetics. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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