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polytene
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Definitions of polytene in various dictionaries:
Relating to or having large, multistranded chromosomes whose corresponding chromomeres are in contact.
adj - having chromosomes of a certain type
POLYTENE - Polytene chromosomes are large chromosomes which have thousands of DNA strands. They provide a high level of function in certain tissues such as sali...
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Relating to or having large multistranded chromosomes whose corresponding chromomeres are in contact. |
Polytene description |
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Polytene chromosomes are large chromosomes which have thousands of DNA strands. They provide a high level of function in certain tissues such as salivary glands.Polytene chromosomes are first reported by E.G.Balbiani in 1881. Polytene chromosomes are found in dipteran flies: the best understood are those of Drosophila, Chironomus and Rhynchosciara. They are present in another group of arthropods of the class Collembola, a protozoan group Ciliophora, mammalian trophoblasts and antipodal, and suspensor cells in plants. In insects, they are commonly found in the salivary glands when the cells are not dividing. * They are produced when repeated rounds of DNA replication without cell division forms a giant chromosome. Thus polytene chromosomes form when multiple rounds of replication produce many sister chromatids which stay fused together. * Polytene chromosomes, at interphase, are seen to have distinct thick and thin banding patterns. These patterns were originally used to help map chromosome |