Question

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

	A	B	C
(a)	Centriole	Satellite	Primary constriction
(b)	Centriole	Satellite	Secondary constriction
(c)	Centromere	Satellite	Secondary constriction
(d)	Centromere	Satellite	Primary constriction

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (C)

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 chromosome 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