what are secondary constrictions and satellite chromosomes
Answers
Answered by
0
Secondary constrictions are useful in identifying a chromosome from a set. Due to secondary constriction, a knob-like structure is formed at the end called a satellite chromosome (SAT chromosome). DNA in a secondary constriction which forms rRNA is called rDNA.NORs occur in SAT chromosomes (13,14,15,21,22).
Answered by
0
Answer: Secondary constrictions mark the locations at which the nucleoli are assembled.It is associated with the nucleolus during interphase of cell division and take part in reorganization of nucleolus at the end of the cell division. Some parts of secondary constrictions are also called "Nucleolar Organizing Region".
Satellite chromosomes are chromosomes that contain secondary constructs that serve as identifying markers. Besides the centromere, one or more secondary constrictions can also be observed in some chromosomes at metaphase. DNA in a secondary constriction which forms rRNA is called rDNA.
Hope this is helpful :-)
Similar questions