polytene chromosome


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Related to polytene chromosome: lampbrush chromosome

polytene chromosome

[′päl·i‚tēn ′krō·mə‚sōm]
(genetics)
A giant, multistranded, chromosome produced by multiple sounds of endoreduplication and thus composed of many copies of the parental chromosome pair having their chromomeres in register. Also known as Balbiani chromosome.
References in periodicals archive ?
Many morphospecies of black flies are in reality complexes of sibling species differentiable only when polytene chromosomes are analyzed (Shields and Procunier, 1982; Procunier, 1984; Rothfels, 1989; Adler et al.
It was not possible for us to utilize the first and second instar larval stages for species identification, as they are small, present deep inside the food and their polytene chromosome preparations are not very good.
Polytene chromosomes and phylogenetic relationships of Chironomus atrella (Diptera: Chironomidae) in North America.
Black flies (Diptera: Simuliidae) provide an interesting case study of the role that chromosome change may play in the diversification process because the morphospecies of classical taxonomy almost always reveals itself as any number of sibling species when polytene chromosomes of larval salivary glands are analyzed (Rothfels, 1988).
The genotypes of adult females and their mates are determined by cytological examination of polytene chromosomes from 12 offspring.
1979), chromosome pairing in interspecific hybrids (Throckmorton 1982; Krimbas and Loukas 1984), banding patterns in polytene chromosomes (Ashburner and Berendes 1978), and in situ hybridization (Whiting et al.
Immunological method for mapping genes on Drosophila polytene chromosomes.
For example, he concluded that polytene chromosomes of insects' salivary glands and other tissues represented a particular form of endopolyploidy and suggested that there were probably different levels of replication of the chromosome thread in different regions of some polytene chromosomes.
For example, both chapters on ISH to polytene chromosomes are nearly the same as in the first edition, down to the illustrations and references, and both cover similar material.