CHIASMATA AND CROSSING OVER IN A DICENTRIC CHROMOSOME IN WHEAT
نویسندگان
چکیده
منابع مشابه
Chromosome Structure and Crossing Over.
A major obstacle to understanding classical genetic crossing over in higher organisms has been the lack of sufficient knowledge concerning the structure of chromosomes. Without accurate information, in particular, as to how the hereditary substance (DNA) is built into the chromosome, it may be premature to devise models depicting how that material may be recombined in crossing over. In recent y...
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Dicentric Y chromosome in mixed gonadal dysgenesis.
A 15-year-old girl was investigated because of ambiguous genitalia. Her chromosome studies showed a 45, X/45, Xdic(Yq) mosaicism. The identity of the dicentric Y chromosome was demonstrated by its typical fluorescent banding patterns. Histological evidence of mixed gonadal dysgenesis with intragonadal tumour was observed, confirming the occurrence of gonadoblastoma associated with mosaicism in ...
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We describe a 28 year old male with a pseudodicentric Y chromosome who suffered from azoospermia attributed to maturation arrest of the primary spermatocyte, as diagnosed by testicular biopsy. Chromosome analysis, using G, Q and C banding techniques, revealed an abnormal karyotype of 45,X[7]/46,X,psu dic (Y)(pter-->q11.2::q11.2-->pter)[33]. Polymerase chain reaction (PCR) DNA analysis did not d...
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This paper proposes a general model for interference in genetic crossing over. The model assumes serial occurrence of chiasmata, visualized as a renewal process along the paired (or pairing) chromosomes. This process is described as an underlying Poisson process in which the 1st, n + 1th, 2n + 1th, etc., events are to be interpreted as realized chiasmata. Chromatid interference is described in ...
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ژورنال
عنوان ژورنال: Genetics
سال: 1953
ISSN: 1943-2631
DOI: 10.1093/genetics/38.3.244