In humans, the autosome that spans about 138 million base pairs, likely to contain about 700 or less than 900 genes, and is a submetacentric chromosome
In humans, the chromosomes occur in pairs and a typical somatic cell would contain 23 pairs of chromosomes in the nucleus. Each of these pairs has a characteristic length and banding pattern. There are two types of chromosomes: autosomes and allosomes. There are also two sets: the first set comes from the mother and the second set, from the father. Using idiograms, each chromosome may be identified one from the other based on the relative size and the banding pattern.
Chromosome 9 is a submetacentric autosome. It spans almost 138 million base pairs (i.e. about 4 to 4.5 % of the total DNA). It is likely to contain about 700 or less than 900 genes. Some of the genes found in this chromosome are COL5A1 (coding for collagen, type V, alpha 1), NANS (for N-acetylneuraminate synthase), PLAA (for phospholipase A-2-activating protein), REXO4 (for RNA exonuclease 4), STOML2 (for stomatin-like protein 2), and ZNF79 (for zinc finger protein 79).
Some of the diseases and disorders related to the genes on chromosome 9 include citrullinemia, Friedreich ataxia, galactosemia, OCD, and trisomy 9.