Chromosome Pairing
نویسندگان
چکیده
منابع مشابه
Chromosome pairing in polyploid cells.
The homologues in polyploid metaphases of air-dried suspensions of cultured cells are usually seen closely paired as diplochromosomes ("endore duplicated" cells) or unpaired as randomly distributed chromosomes ("poly ploid" cells). More often we find another configuration, a mixture of paired and unpaired chromosomes in the same metaphase, and describe here the conditions under which it appears...
متن کاملHomologous chromosome pairing in wheat.
Bread wheat is a hexaploid (AABBDD, 2n=6x=42) containing three related ancestral genomes, each having 7 chromosomes, giving 42 chromosomes in diploid cells. During meiosis true homologues are correctly associated in wild-type wheat, but a degree of association of related chromosomes (homoeologues) occurs in a mutant (ph1b). We show that the centromeres are associated in non-homologous pairs in ...
متن کاملHomoeologous chromosome pairing across the eukaryote phylogeny.
During the past quarter century, molecular phylogenetic inferences have significantly resolved evolutionary relationships spanning the eukaryotic tree of life. With improved phylogenies in hand, the focus of systematics will continue to expand from estimating species relationships toward examining the evolution of specific, fundamental traits across the eukaryotic tree. Undoubtedly, this will e...
متن کاملCytogenetics of chromosome pairing in wheat.
Meiotic chromosome pairing in Triticum aestivum is controlled by genetic systems promoting and reducing pairing. The pairing of homoeologous chromosomes is prevented principally by the activity of a single locus (Ph) distally located on the long arm of chromosome 5B. In certain hybrids, supernumerary chromosomes (B chromosomes) from Aegilops species can compensate for the absence of chromosome ...
متن کاملChromosome Pairing: A Hidden Treasure No More
Many generations of biologists have been intrigued by the myriad structures that eukaryotic chromosomes can adopt and have questioned how their form relates to function [1,2]. One organizational state that chromosomes adopt is pairing in a homology-dependent manner [3–8]. Although homolog pairing in meiosis has been extensively studied and is important for chromosome segregation, pairing of hom...
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ژورنال
عنوان ژورنال: Nature
سال: 1972
ISSN: 0028-0836,1476-4687
DOI: 10.1038/240126a0