A) chromomere
B) secondary constriction
C) primary constriction
D) chromocentre
Correct Answer: C
Solution :
The centromere lies within a thinner segment of chromosome the primary constriction. Centromeres are found to contain specific DNA sequences with special proteins bound to them, forming a disc shaped structure called, kinetochore. Chromomeres are bead like accumulation of chromatin material. These are regions of tightly folded DNA and become clear in polytene chromosome. The chromosomes besides primary constriction or centromere possess secondary constrictions It can be distinguished from primary constriction because chromosome bends only at the position of centromere during anaphase. In Drosophila melanogaster the polytene chromosomes radiate as 5 long and 1 short arm from a deeply staining and more or less amorphous structure called, chromocentre.
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