WebThis chapter discusses the composition and structure of giant chromosomes. Recent advances in chromosome chemistry, the salivary gland-type chromosome, the … WebPolytene or Giant Chromosomes: The multiple replicates of the same chromosome holding together in a parallel fashion resulting in very thick chromosome are known as polytene chromosomes and such condition is referred to as polyteny. They were first reported by Balbiani (1881) in salivary glands of dipteran insects.
Kinds of Chromosomes: Lampbrush, Polytene and Supernumerary
WebChromosome. Chromosomes are the genetic material present in all cells. They are present in the nucleus of a eukaryotic cell. They are a thread-like structure. Each chromosome of a eukaryotic cell contains DNA and associated proteins, known as histone proteins. They are responsible for the hereditary traits and passed from parents to … bridgewater philadelphia gluten free
Polytene Chromosome - an overview ScienceDirect Topics
In insects, polytene chromosomes are commonly found in the salivary glands; they are also referred to as "salivary gland chromosomes". The large size of the chromosome is due to the presence of many longitudinal strands called chromonemata; hence the name polytene (many stranded). They … See more 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 of insects. Polytene … See more In addition to increasing the volume of the cells' nuclei and causing cell expansion, polytene cells may also have a metabolic advantage as multiple copies of genes permits a high level of gene expression. In Drosophila melanogaster, for example, the chromosomes of … See more • Baudisch W (1977). "Balbiani ring pattern and biochemical activities in the salivary gland of Acricotopus lucidus (Chironomidae)". … See more • [1] (87A&C Heat-shock puffs) • [2] (High resolution spreads) • Phaseolus Polytene chromosomes (Plants) See more Polytene chromosomes were originally observed in the larval salivary glands of Chironomus midges by Édouard-Gérard Balbiani in … See more Polytene chromosomes are present in secretory tissues of dipteran insects such as the Malpighian tubules of Sciara and also in protists, plants, mammals, or in cells from other insects. Some of the largest polytene chromosomes described thus far occur in larval salivary gland … See more WebIntroduction Polytene chromosomes are giant chromosome common to many dipteran flies, such as Drosophila, Chiroptera, etc. It was first discovered by E. G. Balbiani in 1881 in the salivary glands of dipterans and called it as salivary gland chromosome. They develop by multiple replications due to endomitosis without segregation of the chromosomes … http://gcwk.ac.in/econtent_portal/ec/admin/contents/159_18ZC304%20_2024102702444153.pdf bridgewater phone code