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

Polytene chromosomes are formed by

Match column-$I$ with column-$II$ and choose the correct option.

Column-$I$ (Chromosome)	Column-$II$ (Position of Centromere)
$A$. Metacentric	$I$. At the tip
$B$. Submetacentric	$II$. Almost near the tip
$C$. Acrocentric	$III$. At the middle
$D$. Telocentric	$IV$. Slightly away from the middle

Which of the following components are included in the structure of the nucleus?

Which of the following are used to define the karyotype of a species?
$1$. The number of chromosomes
$2$. The chromosome length
$3$. The positions of the centromeres

The shorter and longer arms of a submetacentric chromosome are referred to as: