Question

Giant chromosomes are found in
A. Salivary glands of man
B. Salivary glands of women
C. Salivary glands of all animals
D. Salivary glands of drosophila

Answer 1

Hint: There are some chromosomes which are incredibly huge contrasted with typical chromosomes. Such chromosomes, called mammoth chromosomes,or giant chromosomes, happen in some creature cells.

Complete answer:
Two kinds of giant chromosomes are known:
1. Lamp Brush Chromosomes:
These chromosomes happen in the oocytes (germ cells in the ovary) of creatures of land and water and in certain creepy crawlies. They are very huge synapsed homologous chromosomes which can be found in the diplotene phase of prophase I in meiosis.
They measure around 1500 to 2000 long. A lampbrush chromosome consists of a hub from which matched circles stretch out in inverse ways, giving the presence of a light brush. The hub comprises chromomeres (nucleosomes) and inter chromomere areas.
The circles comprise of transcriptionally dynamic DNA which can incorporate enormous measure of mRNA, essential for the union of yolk.

2. Polytene Chromosomes
These are monster chromosomes found in the salivary organ cells of the natural product fly, Drosophila. They are ordinarily bigger than the ordinary chromosomes arriving at a length of 2000 and are obvious much under a compound magnifying instrument.
The polytene chromosomes seem to contain five long and one short arm transmitting from an essential issue called chromocenter. It is shaped by the combination of centromeres of all the eight chromosomes found in the cell. Of the 6 arms, the short arm speaks to the combined IV chromosome and the longest speaks to the melded sex chromosomes.
These arms contain various chromonemata coming about because of rehashed replication of DNA, without partition into little girl chromosomes. The arms show trademark dim groups and light groups. The dim groups are euchromatic districts.

So, the correct answer is D.

Note: A portion of the dim groups briefly swell up and structure extensions called chromosomal puffs or Balbiani rings. These locales contain effectively interpreting DNA associated with the union of RNA types