By Tariq Ahmad Bhat, Aijaz Ahmad Wani
This ebook is a compilation of assorted chapters contributed via a gaggle of prime researchers from diverse nations and overlaying brand new details in accordance with released studies and private adventure of authors within the box of cytogenetics. starting with the creation of chromosome, the next chapters on association of genetic fabric, karyotype evolution, structural and numerical adaptations in chromosomes, B-chromosomes and chromosomal aberrations supply an in-depth wisdom and simple knowing of the subject material. a unique characteristic of the e-book is the inclusion of a chain of chapters on a variety of forms of chromosomal aberrations and their influence on breeding behaviour and crop development. the potential mechanism, their results and function in genetic research has been emphasised in those chapters. a number of chapters have additionally been committed on a number of thoughts many times utilized in the laboratory through scholars and researchers. each one bankruptcy ends with an intensive bibliography in order that the scholars and researchers may perhaps locate it correct to refer to extra literature at the topic than a e-book of this dimension can supply. The publication is meant to satisfy the wishes of undergraduate and put up graduate scholars of botany, zoology and agriculture in addition to, lecturers and researchers engaged within the box of genetics, cytogenetics, and molecular genetics. typically the readers will locate every one bankruptcy of the ebook informative and simple to understand.
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Extra info for Chromosome Structure and Aberrations
The grasshopper Eyprepocnemis plorans has multiple, stable, types of Bs, but most are randomly inherited, with no drive or drag mechanism observed in males or females (López-León et al. 1992). 3 Origins and Sequence Content of B Chromosomes The origin of Bs has long been debated, although host genomes have generally been accepted as the donors of B sequences. Recent advances in sequencing technology have shown that, indeed, many Bs arose from host genome As, although some Bs almost certainly began as interspecific alien chromosomes.
Genetics 133:637–648 Birchler JA (1994) Dosage analysis using B-A translocations. In: Freeling M, Walbot V (eds) The maize handbook. Springer–Verlag, New York, pp 328–329 Birchler JA (2015) Engineered minichromosomes in plants. Chromosome Res 23:77. 1007/ s10577-014-9454-4 Blunden R, Wilkes TJ, Forster JW, Jimenez MM (1993) Identification of the E3900 family, a second family of rye B chromosome specific repeated sequences. Genome 36:706–711 Bougourd SM, Parker JS (1979) The B–chromosome system of Allium schoenoprasum.
2 B Chromosomes 31 As in maize, the A genome of E. plorans also appears to be in conflict with invading Bs (Herrera et al. 1996; Camacho et al. 1997; Perfectti et al. 2004). As briefly described above, E. plorans has multiple types of Bs, and the majority of them seem to have no net drive or drag, that is, they are randomly inherited (López-León et al. 1992). However, extensive research has suggested that the presumed ancestral B type, B1, was neutralized by the A genome, then replaced by a new B, B2, in a subset of the E.
Chromosome Structure and Aberrations by Tariq Ahmad Bhat, Aijaz Ahmad Wani