Based on what are the four types of chromosomes classified?

Which of the following is not contained in a eukaryotic nucleus?

Read the following statements $:-$
$(i)$ Centromere is present in the middle of the chromosomes and forms two equal arms.
$(ii)$ Chromosome has a terminal centromere.
$(iii)$ Centromere lies close to the end of the chromosome forming one extremely short and one very long arm.
$(iv)$ Centromere lies slightly away from the middle of the chromosome resulting in one shorter arm and one longer arm.
Select the correct option as per the codes given below $:-$

Chromatin is essentially composed of

The number of large,metacentric chromosomes in humans is:

The shape of the chromosome is determined by