The shape of the chromosome is determined by

Some chromosomes have non-staining secondary constrictions at a constant location. What are these small fragments called?

In which of the following organisms is the given structure $NOT$ found?

$A$ chromosome in which the $centromere$ is situated near one end is known as

The nucleolus is synthesized at which region?

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