The following diagram represents a structure chromosome. Identify the structures marked as A, B and C.
A. A - Satellite, B - Primary constriction, C - Acrocentric
B. A - Satellite, B - Secondary constriction, C - Metacentric
C. A - Satellite, B - Centromere, C - Telocentric
D. A - Satellite, B - Centromere, C - Submetacentric
Correct Answer : B.
The figure shows the structure of metacentric (C) chromosomes. The parts marked as A and B are respectively are satellite and secondary constriction. Metacentric chromosomes have the centromere in the centre, due to which both sections are of equal length. Human chromosome 1 and 3 are metacentric.