The part of chromosome beyond the secondary constriction is known as $:-$

Different types of chromosomes can be recognised by the position of the following separating the two arms.

By which structure does the transfer of protein and $RNA$ occur between the nucleoplasm and the cytoplasm?

The centromere is a part of the ......... .

Centromere is part of

$S -$ Statement: Based on the position of the centromere,chromosomes are classified into four types.
$R -$ Reason: Chromosomes contain a centromere,which is a primary constriction or disc-shaped structure.