Levels of gene control (Chromatin structure)

What does chromatin packing do?

Keeps genes turned off

What are heterochromatin?

They are inactive genes, and are located in darkly staining portions of chromatin (xmes are condensed)

What are Euchromatin?

They are loosely packed areas of active genes, proteins known as chromatin remodelling complexes push nucleosomes apart

What is an example of chromatin (inactive genes)?

Barr bodies

Which gender are barr bodies only found in?

Females

What do barr bodies look like

They are darkly stained masses of condensed chromatin that adheres (sticks to) the inner edge of the nuclear envelope

What type of chromosomes does barr bodies appear in?

Inactive X chromosome