Quinacrine fluorescence of specific chromosome regions

Chromosoma ◽  
1972 ◽  
Vol 36 (4) ◽  
pp. 375-390 ◽  
Author(s):  
J. R. Ellison ◽  
H. J. Barr
Keyword(s):  
Specific Chromosome ◽  
Quinacrine Fluorescence ◽  
Chromosome Regions

Dosage effects on morphological and quantitative traits in maize aneuploids

Genome ◽  
1996 ◽  
Vol 39 (5) ◽  
pp. 898-908 ◽  
Author(s):  
E. A. Lee ◽  
L. L. Darrah ◽  
E. H. Coe
Keyword(s):  
Zea Mays ◽  
Quantitative Traits ◽  
Zea Mays L ◽  
Genetic Relationships ◽  
Specific Chromosome ◽  
Phenotypic Changes ◽  
Dosage Effects ◽  
Quantitative Characters ◽  
Chromosome Arm ◽  
Chromosome Regions

Dosage effects generated by either loss or gain of a chromosome segment were used to identify chromosome regions associated with morphological and quantitative characters in maize (Zea mays L.). Using B–A translocation stocks introgressed into a B73Ht background, a chromosome arm dosage series in a Mo17Ht × B73Ht F1 hybrid background was created for 18 of the 20 chromosome arms. The dosage series was then evaluated for 12 quantitatively inherited characters to associate specific phenotypic changes in a trait with a specific chromosome arm. Not only did our results show the familiar aneuploid syndrome phenomenon, but differential dosage effects among particular chromosome arms were demonstrated. All the quantitative traits measured and all the chromosome arms examined in this study were responsive to changes in chromosome arm dosage. The possible bases behind those differences and their utility in identifying quantitative trait loci, as well as the genetic relationships among the group of quantitatively inherited characters studied, are considered. Key words : corn, chromosome arm, B–A translocations, dosage analysis.

Clustering of aberrations to specific chromosome regions in benign neoplasms

1991 ◽  
Vol 48 (2) ◽  
pp. 194-198 ◽  
Author(s):  
Chandrika Sreekantaiah ◽  
Avery A. Sandberg
Keyword(s):  
Benign Neoplasms ◽  
Specific Chromosome ◽  
Chromosome Regions

scholarly journals Telomeres and Subtelomeres Dynamics in the Context of Early Chromosome Interactions During Meiosis and Their Implications in Plant Breeding

2021 ◽  
Vol 12 ◽  
Author(s):  
Miguel Aguilar ◽  
Pilar Prieto
Keyword(s):  
Plant Breeding ◽  
Agronomic Traits ◽  
Specific Chromosome ◽  
Chromatin Dynamics ◽  
Homologous Chromosomes ◽  
Chromosome Manipulation ◽  
Chromosome Recombination ◽  
Chromosome Associations ◽  
Chromosome Regions ◽  
Donor Species

Genomic architecture facilitates chromosome recognition, pairing, and recombination. Telomeres and subtelomeres play an important role at the beginning of meiosis in specific chromosome recognition and pairing, which are critical processes that allow chromosome recombination between homologs (equivalent chromosomes in the same genome) in later stages. In plant polyploids, these terminal regions are even more important in terms of homologous chromosome recognition, due to the presence of homoeologs (equivalent chromosomes from related genomes). Although telomeres interaction seems to assist homologous pairing and consequently, the progression of meiosis, other chromosome regions, such as subtelomeres, need to be considered, because the DNA sequence of telomeres is not chromosome-specific. In addition, recombination operates at subtelomeres and, as it happens in rye and wheat, homologous recognition and pairing is more often correlated with recombining regions than with crossover-poor regions. In a plant breeding context, the knowledge of how homologous chromosomes initiate pairing at the beginning of meiosis can contribute to chromosome manipulation in hybrids or interspecific genetic crosses. Thus, recombination in interspecific chromosome associations could be promoted with the aim of transferring desirable agronomic traits from related genetic donor species into crops. In this review, we summarize the importance of telomeres and subtelomeres on chromatin dynamics during early meiosis stages and their implications in recombination in a plant breeding framework.

Epigenetics of specific chromosome regions

2006 ◽  
Vol 42 (9) ◽  
pp. 998-1010 ◽  
Author(s):  
A. V. Vershinin
Keyword(s):  
Specific Chromosome ◽  
Chromosome Regions

scholarly journals Transmission of Duplication-Deficiencies from Cotton Translocations Is Unrelated to Map Lengths of the Unbalanced Segments

Genetics ◽  
1987 ◽  
Vol 116 (2) ◽  
pp. 321-330
Author(s):  
Margaret Y Menzel ◽  
Brian J Dougherty
Keyword(s):  
Gossypium Hirsutum ◽  
Specific Chromosome ◽  
Gossypium Hirsutum L ◽  
Chromosome Arm ◽  
Chromosome Regions ◽  
Metaphase I

ABSTRACT Adjacent-1 duplication-deficiencies (dp-dfs) are readily recovered from most heterozygous translocations in Gossypium hirsutum L., but frequencies of specific cytotypes differ widely in progenies from heterozygote (♀) x standard crosses. Surprisingly, these frequencies seem to be unrelated to the primary (postmeiotic) frequencies predicted by metaphase I configurations or to the proportion of the chromosome arm that is duplicate or deficient. Deficiencies and duplications from different translocations involving the same arm, as well as the two complementary dp-dfs from the same translocation, seldom exhibit similar frequencies. We conclude that the frequency of each of 101 different adjacent-1 cytotypes is largely idiosyncratic and may depend in part on interactions between the specific chromosome regions that are respectively trisegmental and monosegmental. Few, if any, of these interactions can be between homoeologues of the Ah and Dh genomes. Adjacent-2 dp-dfs are seldom recovered, even if they involve chromosomes that are readily tolerated in monosomic condition. Comparison of monosomes and telosomes with deficiencies suggests that some chromosomes and chromosome regions may be more dosage-sensitive than others, but their identification is not strongly supported by these data.

Sign in / Sign up

Export Citation Format

Share Document