The Evolution of Genetics - download pdf or read online

By Arnold W. Ravin and Alvin Nason (Auth.)

ISBN-10: 1483229556

ISBN-13: 9781483229553

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We know, however, that this cannot be entirely true. Since 1910, it has been known that mutations may cause defects in the photosynthetic apparatus of green plants. One such mutation is characterized by "albino" (chlorophyll-less) chloroplasts. The seat of this mutation turns out not to be a chromosomal gene, but a hereditary determinant located within the chloroplast itself, for the albino character can be shown to depend not on the source of the cell's nucleus, but on the source of the cell's cytoplasm.

There are two distinct differences in the nature of the mold's life cycle. On the one hand, the portion of the life cycle in which the mold is haploid is considerably greater than that of the higher organisms. Indeed, shortly after fertilization, when the diploid condition is restored, meiosis ensues to give rise to haploid nuclei, which is the condition of most of the nuclei of the mold during the course of its growth. On the other hand, reproduction is divorced from recombination, so that increase in the number of mold organisms can occur without necessitating gamete production, fertilization, or recombination.

MacLeod, showed that DNA could convey genetic information from one bacterium to another. Avery and his associates had been studying for a decade the chemical nature of the substance responsible for an extraordinary phenomenon first reported by the English bacteriologist, F. Griffith, in 1927. Griffith had observed that a heatkilled vaccine of virulent pneumococci ( the bacteria causing pneumonia) could convert an avirulent pneumococcal mutant into a disease-producer when a mixture of the vaccine and avirulent bacteria was inoculated into mice.

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The Evolution of Genetics by Arnold W. Ravin and Alvin Nason (Auth.)


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