Explanation

Histones help in packaging of DNA. In eukaryotes, DNA packaging is carried out with the help of positively charged basic proteins called histones. Histones are of five types [image:6_image57.wmf], [image:6_image58.wmf]and [image:6_image59.wmf]. The association of [image:6_image60.wmf] histone with nucleosome indicates that DNA remains in its condensed form. Nucleosome is the unit of compaction. [image:6_image61.wmf] is attached over the linker DNA. The linker DNA, consisting of [image:6_image61.wmf]histone connects two adjacent nucleosomes. They together consititute chromatosome. It gives rise to a chromatin fibre after further condensation.