The grouping of human chromosomes is based on

  • A
    Secondary constrictions alone
  • B
    Dot-like satellites alone
  • C
    Banding patterns alone
  • D
    All the above

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Which cellular structure helps in transferring genetic information from one generation to another?

$S -$ Assertion: Individual chromosomes are not identifiable during interphase.
$R -$ Reason: They exist as highly extended and elaborate nucleoprotein fibers called chromatin.

The factory of ribosomes in the cell is ........

In which type of chromosome is one arm very short and the other arm very long?

Which one of the following is the site for active ribosomal $RNA$ synthesis?

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