Chromosomes

Cell biology · Cell division · note 1 of 3

Spec 4.1.2.1Download these notes (PDF)4 pages

ChromosomesSpec 4.1.2.1

The nucleus of a cell contains chromosomes made of DNA molecules. Each chromosome carries a large number of genes. In body cells the chromosomes are normally found in pairs.

A nucleus containing two pairs of chromosomes, with one chromosome enlarged to show a long DNA molecule with three genes marked along it. — A nucleus contains chromosomes in pairs. Each chromosome is a long DNA molecule carrying many genes.