Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
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.