Question

Draw and describe differences between euchromatin and heterochromatin; include differences in their structure as well as functional differences. Compare and contrast facultative and constitutive heterchromatin.

Answer 1

Answer:

1).

The chromatin material is of two types Heterochromatin and euchromatin. The chromosomes show differential staining.

Heterochromatin:

The darkly stained parts are called as heterochromatic regions or simply heterochromatin. Hetero chromatin contains inactive DNA. It is metabolically and genetically inert because it contains small amount of DNA and large amount of RNA.

Euchromatin:

The light stained region of chromatin is called the euchromatic part or euchromatin. It is genetically active portion. Contains large amount of DNA and is involved in transcribing RNA to produce proteins.

Constitutive heterochromatin	Facultative heterochromatin
It is stable. It cann't be revert to the euchromatin stage	It is reversible and can revert to euchromatin stage
It contains satellite DNA	It is enriched in LINES sequences
It has polymorphism +	It has polymorphism -
It has C bands +	It has C bands -