Chromosomes are composed of .......

........ is present in a higher amount in the dark band of a polytene chromosome.

Describe the nucleus in detail.

If the centromere is situated slightly away from the middle of the chromosome, resulting in one shorter arm and one longer arm, such a chromosome is called .......

In $1920$,nucleic acid was identified as a major component of which of the following?

Describe the composition, structure, and types of chromosomes.