Results 121 to 130 of about 43,615 (154)
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Chromosome pairing in haploids of Brassica campestris
Theoretical and Applied Genetics, 1981The maximum chromosome pairing observed in haploids of Brassica campestris was two bivalents plus one trivalent but differences were observed in the chromosome pairing frequencies of the four haploids studied. This pairing supports the theorem that the species is hexasomic for one chromosome, tetrasomic for two and disomic for three others but it is ...
K C, Armstrong, W A, Keller
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THE PAIRING OF AN ALIEN CHROMOSOME WITH HOMOEOLOGOUS CHROMOSOMES OF WHEAT
Canadian Journal of Genetics and Cytology, 1972The homoeology of chromosome A of Triticum umbellulatum has been determined by studying its pairing relationships with wheat telocentrics in hybrids having the chromosome constitution of 20 wheat chromosomes + one wheat telocentric chromosome + seven Triticum speltoides chromosomes + chromosome A.
Raghbir S. Athwal, Gordon Kimber
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Chromosome pairing and induced exchange in Drosophila
Mutation Research, 1965Abstract Fragments of Y chromosomes were induced by irradiating attached-X Drosophila melanogaster females carrying a doubly marked Y chromosome, and detected by loss of one of the Y markers. Slightly more than half of the 55 fragments recovered showed linkage of fourth chromosome markers, implying a high frequency of association of Y and fourth ...
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Meiotic segregation of a homeologous chromosome pair
Molecular Genetics and Genomics, 2003During meiosis, the alignment of homologous chromosomes facilitates their subsequent migration away from one another to opposite spindle poles at anaphase I. Recombination is part of the mechanism by which chromosomes identify their homologous partners, and serves to link the homologs in a way that, in some organisms, has been shown to promote proper ...
Maxfield Boumil, R. +4 more
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Classifier-assisted metric for chromosome pairing
2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010Cytogenetics plays a central role in the detection of chromosomal abnormalities and in the diagnosis of genetic diseases. A karyogram is an image representation of human chromosomes arranged in order of decreasing size and paired in 23 classes. In this paper we propose an approach to automatically pair the chromosomes into a karyogram, using the ...
Rodrigo, Ventura +2 more
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Triple Chromosome Pairing in Triploid Chickens
Nature, 1971THE statement that “only two homologous chromosomes can pair at one time” is one of the most basic of cytogenetic principles. It is founded on observations of meiosis in triploid and tetraploid organisms1–7 which have suggested that if three homologues are present, they will occur as a pair and a single unpaired chromosome.
D E, Comings, T A, Okada
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Sex-chromosome pairing and male fertility
Cytogenetics and Cell Genetics, 2008In this paper a hypothesis is presented which relates chromosome pairing and sterility in males. This hypothesis has been formulated on the basis of data from numerous meiotic systems in the male of Drosophila melanogaster, where the sex chromosomes have heterochromatic pairing sites, sites which must interact in order for postmeiotic development to be
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Efficient DNA pairing in a Neurospora mutant defective in chromosome pairing
Molecular and General Genetics MGG, 1991A Neurospora crassa mutation, mei-2, affecting recombination and pairing of homologous chromosomes during meiosis, was characterized for its effect on repeat-induced point mutation (RIP). We found that RIP, which depends on recognition of DNA sequence homology, is not inhibited by mei-2, suggesting that the defect in chromosome pairing of this mutant ...
H M, Foss, E U, Selker
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GENETIC CONTROL OF CHROMOSOME PAIRING IN WHEAT
Annual Review of Genetics, 1976OTHER WHEAT GENES AFFECTING PAIRING . . ....... . . . . . . . . ......... . . . . ........ ...... 37 Promoters of Pairing 37 Suppressors of Pairing 38 GENES IN OTHER SPECIES THAT AFFECT PAIRING 39 THE EFFECT OF ACCESSORY CHROMOSOMES ...
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THE EFFECT OF COLCHICINE ON CHROMOSOME PAIRING
Canadian Journal of Genetics and Cytology, 1977Beginning at 120 hours prior to first metaphase of meiosis (MI) a 0.03% aqueous solution of colchicine was injected into the boot of pentaploid (hexaploid triticale × tetraploid wheat) hybrids developing at 20 °C ± 1° under continuous illumination. Colchicine applied 40 h or less prior to MI had no effect on chromosome pairing, while its application 40
J. B. Thomas, P. J. Kaltsikes
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