Observations on the inheritance of sex in Sciara ocellaris (Diptera).
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چکیده
منابع مشابه
New 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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In Drosophila melanogaster and in Sciara ocellaris dosage compensation occurs by hypertranscription of the single male X chromosome. This article reports the cloning and characterization in S. ocellaris of the gene homologous to maleless (mle) of D. melanogaster, which implements dosage compensation. The Sciara mle gene produces a single transcript, encoding a helicase, which is present in both...
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Spindle formation and chromosome elimination during male meiosis in Sciara ocellaris (Diptera, Sciaridae) has been studied by immunofluorescence techniques. During meiosis I a monopolar spindle is formed from a single polar complex (centrosome-like structure). This single centrosomal structure persists during meiosis II and is responsible for the non-disjunction of the maternal X chromatids. Du...
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Dosage compensation refers to the process whereby females and males with different doses of sex chromosomes have similar amounts of products from sex chromosome-linked genes. We analyzed the process of dosage compensation in Sciara ocellaris, Diptera of the suborder Nematocera. By autoradiography and measurements of X-linked rRNA in females (XX) and males (XO), we found that the rate of transcr...
متن کاملMethylation of histone H3 at Lys4 differs between paternal and maternal chromosomes in Sciara ocellaris germline development.
An outstanding example of programmed chromosome elimination and genomic imprinting is found in sciarid flies (Diptera, Sciaridae), where whole chromosomes of paternal origin are selectively discarded from the genome during development. In early germ cells a single paternal X chromosome is eliminated in embryos of both sexes and in male meiotic cells the whole paternal complement is discarded. I...
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عنوان ژورنال:
- The Ohio journal of science
دوره 47 3 شماره
صفحات -
تاریخ انتشار 1947