key term - Chromatin

Definition

Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. It condenses to form chromosomes during cell division and decondenses for gene expression.

Related terms

Histones: These are proteins that help package DNA into a compact, efficient form by serving as spools around which DNA winds.

Nucleosome: The basic unit of DNA packaging in eukaryotes, consisting of a segment of DNA wound around eight histone proteins.

Euchromatin: A lightly packed form of chromatin that is enriched in genes and is often under active transcription.