The following points highlights the five special types of chromosomes. The types are: 1. Polytene Chromosome or Giant Chromosome 2. B-Chromosome or Supernumerary Chromosome 3. Chimaera 4. SAT-Chromosome. Type # 1. Polytene Chromosome or Giant Chromosome: Object: To prepare acetocarmine squash of giant chromosome or polytene chromosome from salivary glands of Drosophila. Requirements: Drosophila melanogaster larvae. NaCl, acetocarmine solution (1%), [...]
The upcoming discussion will update you about the difference between prokaryotic chromosome and eukaryotic chromosome. Difference # Prokaryotic (Bacterial) Chromosome: 1. Structural organization of bacterial chromosome is simple and is represented mainly by double-stranded DNA molecule. Although there are specific proteins associated with bacterial chromosome (not the histories) that help stabilize its supercoiled domains. Compared to eukaryotic chromosome, one can [...]
Learn about the difference between Euchromatin and Heterochromatin. Difference # Euchromatin: 1. The chromatin fibres in this region are loosely coiled as compared with hetero chromatic regions 2. Euchromatin is deeply stained in divisional cycle but less stained in interphase. 3. The region is genetically active and contains unique DNA. 4. Euchromatic regions are able to synthesize mRNA in vitro. [...]