The puffs and rings are associated with the

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

What is the feature of a metacentric chromosome?

Chromatin found in the nucleus was discovered by

The structure of the chromosome to which spindle fibres are attached is known as:

Identify the correct match between types of chromosomes and their descriptions.

Chromosomes	Position of centromere
$A$. Metacentric	$1$. At the tip
$B$. Submetacentric	$2$. Almost near the tip
$C$. Acrocentric	$3$. At the middle
$D$. Telocentric	$4$. Slightly away from the middle