Triploid Intersexuality in Drosophila Americana Spencer.
نویسنده
چکیده
منابع مشابه
A Study of Intersexuality in Drosophila Virilis.
N THIS paper a detailed account of our study of intersexuality in DroI sophila virilis will be given. The progress of this work has been reported elsewhere (LEBEDEFF 1934a and b, 1938a and b). These intersexes are the result of mutative changes within the normal diploid system, and they differ from intersexes in other species genetically, morphologically and embryologically. Intersexes in Lyman...
متن کاملAn Analysis of the Chromosomes of the Two Sub-Species Drosophila Virilis Virilis and Drosophila Virilis Americana.
NCREASING attention is being focused on the use of Drosophila as a I convenient organism for investigating such fundamental problems as the formation of new species and interspecific sterility. Studies of the hybrid from the cross D. melarzogasterXD. simulans by PATAU (I935), and by HORTON (1939), and D. pseudoobscuraXD. miranda by DOBZHANSKY and TAN (1936), as well as studies of the hybrids fr...
متن کاملEvolution of triploidy in Apios americana (Leguminosae) revealed by genealogical analysis of the histone H3-D gene.
Autotriploidy is normally considered to be maladaptive in plants because of its association with high levels of sterility. Nonetheless, triploid individuals are found in many plant species and play important roles in plant evolution, in particular as a first step toward tetraploid formation. However, few studies have addressed the evolutionary potential of triploid lineages, which may principal...
متن کاملIntersex Modifying Genes in Wild Strains of Drosophila Melanogaster.
HE sex determining mechanism in diploid Drosophila melanogaster is T completely stable. No intersexual individuals are produced from hybridizing strains of D. melanogaster collected from widely separated geographical localities. In Lymantria, on the contrary, GOLDSCHMIDT (1934) has shown that the potencies of the X chromosome sex gene differs in races from Europe and Japan. The degree of sexual...
متن کاملPatterns of molecular variation and evolution in Drosophila americana and its relatives.
We present the results of a survey of DNA sequence variability at X-linked and autosomal loci in Drosophila americana and of patterns of DNA sequence evolution among D. americana and four other related species in the virilis group of Drosophila. D. americana shows a typical level of silent polymorphism for a Drosophila species, but has an unusually low ratio of nonsynonymous to silent variation...
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ورودعنوان ژورنال:
- Genetics
دوره 27 5 شماره
صفحات -
تاریخ انتشار 1942