GENETIC STUDIES ON SELECTIVE SEGREGATION OF CHROMOSOMES IN SCIARA COPROPHILA LINTNER
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چکیده
منابع مشابه
Genetic Studies on Selective Segregation of Chromosomes in Sciara Coprophila Lintner.
HE unusual behavior of the chromosomes in Sciara has been studied T in considerable detail both cytologically and genetically. Although the main facts regarding the distribution and behavior of the chromosomes (as revealed by cytological examination) , have been known for some time, the genetic data have been incomplete because of the paucity of mutant characters with which to follow the histor...
متن کاملGenetic Evidence of a Selective Segregation of Chromosomes in Sciara (Diptera).
This shows that miniature-a mutates to wild type at the formation of germ cells in miniature-a males and heterozygous and homozygous females. Miniature-a mutates to wild type in somatic cells as well. Mosaic flies having part of the wing miniature and the other part wild type are very frequent and are easily distinguished. If miniature-a wings are examined under high magnification almost all of...
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Though the fagellum of Sciara sperm arises from a blepharoplast and is characterized by doublet tubules with arms, it differs markedly from the familiar type of flagella in the number and arrangement of its tubules. The axial filament complex in sperm from the testis of Sciara consists of approximately 70 doublet tubules, each with an associated singlet tubule. Near the nucleus these tubules ar...
متن کاملObservations on Spermiogenesis in the Fungus Gnat Sciara Coprophila
Although 9-membered centrioles are found in somatic tissues of Sciara, the centriole which lies at the spindle pole of the second meiotic division in male Sciara is composed of a row of approximately 70 short tubules in an oval array. Shortly after telophase of this unequal division, in the daughter cell destined to undergo spermiogenesis, microtubules become confluent with the tubules of the c...
متن کاملNew Mutants in Sciara and Their Genetic Behavior.
GENETIC BEHAVIOR H. V. CROUSE AND HELEN SMITH-STOCKING Department of Embryology, Carnegie Institution of Washington, Baltimore, Maryland Received January 31, 1938 H E present paper deals with six new mutant characters in Sciara T found in this laboratory. In addition, two mutants are recorded which appear to be identical with or allelic to two of these characters. Of the six, one is an autosoma...
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ژورنال
عنوان ژورنال: Genetics
سال: 1936
ISSN: 1943-2631
DOI: 10.1093/genetics/21.4.421