Polytene chromosomes were first discovered in which of the following?

Discuss briefly the role of the nucleolus in cells actively involved in protein synthesis.

Who coined the term "chromosome"?

Lampbrush chromosomes are found inside

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

Immature $RBCs$ of mammals are...........