Chiasma frequencies in euchromatic and heterochromatic chromosomes
نویسندگان
چکیده
منابع مشابه
Similarity in base composition of heterochromatic and euchromatic DNA in Drosophila melanogaster.
HE chromosomes of eukaryotes are generally subdivided by cytological and Toperational criteria into heterochromatic and euchromatic regions. Originally, the term heterochromatin was used by HEITZ (1928) to distinguish those heteropycnotic regions of the chromosomes of liverworts and mosses, which remain condensed and intensely stainable during mitotic interphase. The concept of heterochromatin ...
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In polytene chromosomes of D. melanogaster the heterochromatic pericentric regions are underreplicated (underrepresented). In this report, we analyze the effects of eu-heterochromatic rearrangements involving a cluster of the X-linked heterochromatic (Xh) Stellate repeats on the representation of these sequences in salivary gland polytene chromosomes. The discontinuous heterochromatic Stellate ...
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The small fourth chromosome of Drosophila melanogaster (3.5% of the genome) presents a puzzle. Cytological analysis suggests that the bulk of the fourth, including the portion that appears banded in the polytene chromosomes, is heterochromatic; the banded region includes blocks of middle repetitious DNA associated with heterochromatin protein 1 (HP1). However, genetic screens indicate 50-75 gen...
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A role for variant histone H2A.Z in gene expression is now well established but little is known about the mechanisms by which it operates. Using a combination of ChIP-chip, knockdown and expression profiling experiments, we show that upon gene induction, human H2A.Z associates with gene promoters and helps in recruiting the transcriptional machinery. Surprisingly, we also found that H2A.Z is ra...
متن کاملSequential staining of euchromatic and heterochromatic regions of the human Y chromosome.
A sequential silver-Giemsa (SG) procedure is presented, initially to stain the p11 and q11 euchromatic bands and subsequently the q12 heterochromatic band of the human Y chromosomes. A three sub-band division of the q11 band can be identified. The same technique differentially stains the secondary constriction of chromosome 9 as well as most other satellite III DNA regions of the human karyotype.
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ژورنال
عنوان ژورنال: Heredity
سال: 1967
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1967.54