New PDF release: Advances in Genetics

By M. Demerec (Eds.)

ISBN-10: 0120176033

ISBN-13: 9780120176038

This quantity in a sequence on genetics, emphasizes the variety of genetic reports. Articles hide the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable parts and the dropophila gene zeste.

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I n general, i t appears that there is nothing unique or unorthodox in the cytology of Neurospora. Following fusion of two haploid nuclei to form the zygote (the only diploid cell in the life cycle), there occur two meiotic divisions in rapid succession, followed by a mitotic division. Wall formation then takes place, delimiting eight ascospores. Another mitotic division occurs within each ascospore before maturity. The haploid chromosome number is seven. Previous estimates had been six to nine for N .

All the indicated steps except those involving arginase and urease are known to be gene-controlled. BIOCHEMICAL GENETICS OF NEUROSPORA 43 Quite recently, Volcani and Snell (1948) have studied the arginine requirements of a number of different lactic acid bacteria. They find among them strains which exhibit the same types of requirement as Srb and Horowitz found in the Neurospora mutants. Some grow only when arginine is supplied; others can utilize either arginine or citrulline, while still others grow on ornithine, citrulline, or arginine.

The spore is found in the center of the sporangium with some cytoplasm or nuclear substance outside i t in the sporangium. The sporal cytoplasm changes its stainability, and stains sky-blue with Giemsa; the nuclear element moves to the periphery of the spore. 62. The peripheral nuclear element has the shape of an oval ring. Nothing ia visible in the sporangium outside the spore. 63. Liberated spores. Nuclear element in side view. The spore coat is not stained and not visible; it is situated as seen in Fig.

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Advances in Genetics by M. Demerec (Eds.)

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