LETHALS IN ONTOGENY
نویسندگان
چکیده
منابع مشابه
On cell lethals in Drosophila.
Somatic crossing over in flies heterozygous for a dominant Minute mutant may result in two cells, homozygous for wild type and Minute, respectively. If both cells took part in development, a twin spot of two genotypes, different from the rest of the body, would result. Two-hundred wild type spots were found, none of which was accompanied by an adjacent twin spot homozygous for Minute. The absen...
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Background:Spermatogenesis is maintained by a pool of the spermatogonia. The group formed by As, Apr and Aal is known as undifferentiated type a spermatogonia (Aund). The Aal spermatogonia will differentiate, with no mitotic division, to the differentiating type A1 spermatogonia. The type A1 spermatogonia undergo 6 successive mitotic divisions to yield A2, A3, A4, intermediate-type (In), and ty...
متن کاملFrequency of "Cell-Lethals" among Lethals Obtained at Random in the X-Chromosome of Drosophila Melanogaster.
84 per cent albite and we know enough of relations in our general system (Fig. 1) to be able to say that the conditions are similar in mixtures with an excess of silica (simplified fayalite-rhyolites) and also in those with a deficiency of silica (simplified fayalite-phonolites). While we have made only a first step in the investigation of these extreme liquids it is plain from the results of t...
متن کاملThe Nature of Lethals in Drosophzla Wzllzstonz]
is well established that Mendelian populations carry a large amount of con‘:ealed variability. Chromosomes which are lethal when homozygous constitute an important part of the concealed variability in cross-breeding populations as shown, among others, by PAVAN et al. (1951) in Drosophila willistoni. Recessive lethal second chromosomes had a mean frequency of .286 in seven Brazilian populations ...
متن کاملDAISY: picking synthetic lethals from cancer genomes.
A better understanding of genetic interactions in cancer might help identify new therapeutic approaches that exploit the concept of synthetic lethality. Ruppin and colleagues have developed a new computational method, DAISY, that predicts such interactions and potentially facilitates the delineation and validation of comprehensive genetic interaction networks.
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ژورنال
عنوان ژورنال: Evolution
سال: 1961
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1961.tb03164.x