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- W1459939694 abstract "This chapter describes polytene chromosomes of plants. Polytene chromosome structures occur in highly endopolyploid interphase nuclei. They are cable-like bundles of sister chromosomes that are the result of endocycles, that is, chromosome-replication cycles without nuclear division. The chapter reviews the findings of polytene chromosomes in plants and their development and structure in comparison with giant chromosomes in Diptera. The functional and evolutionary aspects of polyteny are also discussed. Polytene chromosomes help to elucidate the biological significance of non-protein-coding DNA. Within the cell nucleus, the huge amount of never expressed DNA exhibits different conformations due to its sequence diversity that is reflected by conformational differences of the chromatin. Thus, different chromatin domains, or polytene chromosome bands, can react to different electrodynamic environments, and hence release specific patterns of domains into active conformation. Polyteny can be utilized as a model system for understanding the role of chromatin patterns in determining the direction of differentiation. Plant polytene nuclei with their high structural variability are useful in the study of the interrelationships among environment, DNA content, cell function, and in relation to the key role of chromatin organization." @default.
- W1459939694 created "2016-06-24" @default.
- W1459939694 creator A5002649771 @default.
- W1459939694 date "1981-01-01" @default.
- W1459939694 modified "2023-09-27" @default.
- W1459939694 title "Polytene Chromosomes of Plants" @default.
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