Human chromosomes picture
Human chromosomes are the structures in cells that contain the cellular
DNA, which contain the linear array of genes. In eukaryotes, the DNA is
divided into chromosomes which "condense" into the familiar X-shaped
structures at mitosis. Each chromosome has a characteristic length and
banding pattern, which is the basis of karyotyping. Different species
contain different numbers of chromosomes. Humans have 23 pairs of
chromosomes. Prokaryotes contain one chromosome, which is circular.