Recognition of homeology by the wheat Ph1 locus.
TLDR
Observations show that Phl does not regulate chromosome pairing by premeiotic chromosome alignment and a mitotic spindle-centromere interaction, as has been suggested, but processes homology along the entire length of chromosomes.Abstract:
Chromosome 1A(m) of Triticum monococcum is closely homeologous to T. aestivum chromosome 1A but recombines with it little in the presence of the wheat suppressor of homeologous chromosome pairing, Ph1. In the absence of Ph1, the two chromosomes recombine as if they were completely homologous. Chromosomes having either terminal or interstitial segments of chromosome 1A(m) in 1A were constructed and their recombination with 1A was investigated in the presence of Ph1. No recombination was detected in the homeologous (1A(m)/1A) segments, irrespective of whether terminally or interstitially positioned in a chromosome, whereas the levels of recombination in the juxtaposed homologous (1A/1A) segments was normal or close to normal relative to completely homologous 1A chromosomes. These observations show that Ph1 does not regulate chromosome pairing by premeiotic chromosome alignment and a mitotic spindle-centromere interaction, as has been suggested, but processes homology along the entire length of chromosomes.read more
Citations
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Meiotic chromosomes: integrating structure and function.
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TL;DR: The current article reviews recent information on diverse aspects of chromosome morphogenesis, notably relationships between sisters, development of axial structure, and variations in chromatin status in an historical context.
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Genetic and epigenetic interactions in allopolyploid plants
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Genome evolution of allopolyploids: a process of cytological and genetic diploidization
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TL;DR: It appears that both genetic and epigenetic operations are involved in the diploidization process of allopolyploids, and genomic sequence elimination and chromosome rearrangement are probably the major forces guiding cytological diploidsization.
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Secondary Tetrasomic Segregation of Mdh-B and Preferential Pairing of Homeologues in Rainbow Trout
TL;DR: A two-stage model of pairing in male meiosis in which homologous chromosomes pair and recombine in the proximal region of the chromosome is proposed and this type of tetrasomic inheritance in which centromeres segregate disomically should be referred to as "secondary tetraomy" to distinguish it from tetrasomy involving entire chromosomes.
References
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Journal ArticleDOI
The estimation of map distances from recombination values.
TL;DR: The genetic map is a tool to quantify the distance between genes on a chromosome, based on the observed frequency of crossovers during cell division, which is used to estimate the total distance between chromosomes.
Journal ArticleDOI
Genetic Control of the Cytologically Diploid Behaviour of Hexaploid Wheat
Ralph Riley,Victor Chapman +1 more
Journal ArticleDOI
Formulas and tables to facilitate the calculation of recombination values in heredity
TL;DR: This study provides the following aids for using the method of maximum likelihood to estimate recombination values and examine heterogeneity when complex genetic data are available: estimation equations for a variety of backcross, F2, and F3 situations.
Journal ArticleDOI
Genetics society of canada award of excellence lecture an induced mutant with homoeologous pairing in common wheat
TL;DR: An apparent deletion of Ph, the chromosome-5B suppressor of homoeologous pairing, was obtained by X-raying normal pollen and using it on plants monosomic for a 5B chromosome carrying the marker Hai.
Journal ArticleDOI
Apparent sources of the A genomes of wheats inferred from polymorphism in abundance and restriction fragment length of repeated nucleotide sequences
TL;DR: Four hundred random DNA fragment clones of wild diploid wheat Triticum monococcum ssp.
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