Question

What does $A,B$ and $C$ represent in the given figure of a chromosome?

• A. A - Centriole, B - Satellite, C - Primary constriction
• B. A - Centriole, B - Satellite, C - Secondary constriction
• C. A - Centromere, B - Satellite, C - Secondary constriction
• D. A - Centromere, B - Satellite, C - Primary constriction

Answer 1

The correct option is C A - Centromere, B - Satellite, C - Secondary constriction

Centromere is a non-stainable area, also called as primary constriction. Secondary constrictions are narrower than the primary constriction. These are necessary for the formation of nucleolus (which is formed in the post mitotic reconstruction phase). The area of a chromosomes distal to the nucleolar organiser is called satellite or trabant. The presence or formation of satellite is called satellitism. Satellite may be small and knob like. A chromosome having satellite is called as sat chromosome.

So, the correct answer is 'A - Centromere, B - Satellite, C - Secondary constriction'.