КНИГИ НА АНГЛИЙСКИЙ ЯЗЫКЕ, ИМЕЮЩЕЕ ОТНОШЕНИЕ К СЛОВУ «POLYTENY»
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The final level of polyteny is usually characteristic for a certain cell type but it is
not accurately predetermined. Malphigian tubule cells in Drosophila
melanogaster, for example, may attain a polyteny of 32 or 64 C, fat-body cells, 64
or 128 C; ...
2
Advances in Insect Physiology APL
Furthermore under certain circumstances transitions from endopolyploidy to
polyteny, and vice versa, occur during development. The functional significance
of polyteny vs. endopolyploidy is obscure; presumably the available surface area
of ...
J. W. L. Beament, J. E. Treherne, Sir Vincent Brian Wigglesworth, 1970
3
Insect Molecular Genetics: An Introduction to Principles and ...
Polyteny. In a normal chromosome replication cycle (mitosis), chromosomes
condense, replicate, separate, and segregate to daughter cells. In polytene cells,
≥10 DNA replication cycles may occur but the daughter chromosomes remain in
an ...
4
Cytology and Cell Physiology
While polyteny in these chromosomes had long been supposed from size and
morphological considerations, the degree of polyteny involved was uncertain,
and it was not known whether there was anything sys~ tematic about the
replication ...
5
Drosophila Cytogenetics Protocols
Numerous studies have attempted to measure polytene levels in various tissues
of D. melanogaster, in other Diptera, and in certain other organisms where
polyteny occurs (reviewed in ref. 152). Table 3 lists some of the quantitative
studies ...
6
Genome Multiplication in Growth and Development: Biology of ...
... and the level of cell renewal. We shall return to some of these questions in
section F of this chapter. E The advantages of polyploidy and polyteny One of the
main consequences of genome multiplication is the increase in cell size. In some
...
Vsevolod I͡Akovlevich Brodskiĭ, Irina Vasilʹevna Uryvaeva, 1985
Polyploidy, Polyteny and Nucleolar Activity In insects, tissue growth involving
DNA synthesis and cell enlargement rather than cell division is common. It is
found in tissues which must rapidly synthesize large amounts of a limited number
of ...
8
Cell Biology A Comprehensive Treatise V3: Gene Expression: ...
The extenuating circumstances which apply in this case are discussed later (
Section III,E). Less clear-cut methods for raising the level of genetic activity are
polyteny and polyploidy. Polyploid cells contain integral multiples of the haploid
DNA ...
9
Nuclear Cytology in Relation to Development
The ultimate level of polyteny is also tissue-specific. For example, in Drosophila
virilis, salivary gland cells may go through ten replication cycles, whereas, in the
same period of development in the same larva, cells in the gastric cecum may ...
10
Competition Science Vision
Polyteny is condition of some chromosomes, nuclei, cells, etc. in which many
identical parallel copies of each chromosome are formed by repeated replication
without separa- tion, and lie side-by-side forming thick cable-like chromosomes.
