Results 311 to 320 of about 319,606 (332)
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Chromosome homology and evolution of emydid turtles
Chromosoma, 1976G-, C-, Q-banding and standard karyotypic analyses were used to study the chromosomal relationships of emydid turtles. Ten species of emydids were used (5 batagurines and 5 emydines) which samples all of the karyotypic variation known for the Emydidae. Data from a testudinid and a chelydrid are compared to the emydids.
J W, Bickham, R J, Baker
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The colocalization transition of homologous chromosomes at meiosis
Physical Review E, 2008Meiosis is the specialized cell division required in sexual reproduction. During its early stages, in the mother cell nucleus, homologous chromosomes recognize each other and colocalize in a crucial step that remains one of the most mysterious of meiosis. Starting from recent discoveries on the system molecular components and interactions, we discuss a
NICODEMI, MARIO, B. Panning, A. Prisco
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Cytogenetic and Genome Research, 2010
Substantial effort has been made to elucidate karyotypic evolution of phyllostomid bats, mostly through comparisons of G-banding patterns. However, due to the limited number of G-bands in respective karyotypes and to the similarity of non-homologous bands, an accurate evolutionary history of chromosome segments remains questionable.
C G, Sotero-Caio +8 more
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Substantial effort has been made to elucidate karyotypic evolution of phyllostomid bats, mostly through comparisons of G-banding patterns. However, due to the limited number of G-bands in respective karyotypes and to the similarity of non-homologous bands, an accurate evolutionary history of chromosome segments remains questionable.
C G, Sotero-Caio +8 more
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A ?zebra? chromosome arising from multiple translocations involving non-homologous chromosomes
Chromosoma, 1993An alloplasmic wheat line carrying a 'zebra' chromosome z5A was isolated from the derivatives of an Elymus trachycaulus x Triticum aestivum cv Chinese Spring hybrid. Chromosome z5A was named zebra because of its striped genomic in situ hybridization pattern. z5A consists of four chromosome segments derived from E.
J, Jiang, B S, Gill
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Phase separation drives pairing of homologous chromosomes
Current Genetics, 2020Pairing of homologous chromosomes is crucial for ensuring accurate segregation of chromosomes during meiosis. Molecular mechanisms of homologous chromosome pairing in meiosis have been extensively studied in the fission yeast Schizosaccharomyces pombe.
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Chromosome territory positioning of conserved homologous chromosomes in different primate species
Chromosoma, 2006Interphase chromosomes form distinct spatial domains called chromosome territories (CTs). The position of CTs is known not to be at random and is related to chromosome size and gene density. To elucidate how CTs are arranged in primate proliferating fibroblasts and whether the radial position of CTs has been conserved during primate evolution, several ...
Laia, Mora +3 more
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Homologies between human and dolphin chromosomes detected by heterologous chromosome painting
Cytogenetic and Genome Research, 1998Human chromosome-specific probes for the entire karyotype were hybridized to metaphase spreads of the Atlantic bottlenose dolphin, <i>Tursiops truncatus, </i>to directly compare the evolutionary conservation of chromosomal segments between these two distantly related species.
P E, Bielec +3 more
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“Homologies” between non-homologous chromosomes in the grasshopper Caledia captiva
Chromosoma, 1978Cytological studies of hybrids between three chromosomal forms of the grasshopper, Caledia captiva, have revealed a clear case of pairing and exchange between non-homologous chromosomes. The genomes of each of the three chromosomal forms are readily identifiable by their marked differences in morphology and in the pattern of C-heterochromatin ...
David D. Shaw, Pat Wilkinson
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Initiation of homologous chromosome pairing during meiosis
Biochemical Society Transactions, 2006Following pre-meiotic DNA replication, homologous chromosomes must be paired and become tightly linked to ensure reductional segregation during meiosis I. Therefore initiation of homologous chromosome pairing is vital for meiosis to proceed correctly. A number of factors contribute to the initiation of homologous chromosome pairing including telomere ...
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Homologous chromosome pairing: The physical problem
Journal of Genetics, 1942Homologous pairing of chromosomes is discussed in its physical aspects. The relevant facts about the cytology of pairing are examined, and the conditions stated which must be satisfied by any physical explanation. It is pointed out that these requirements are at first sight contradictory.
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