Chromosome regions (original) (raw)

Several chromosome regions have been defined by convenience in order to talk about gene loci. Most important is the distinction between chromosome region p and chromosome region q. The p region is represented in the shorter arm of the chromosome (p is for petit, French for small) while the q region is in the larger arm (chosen as next letter in alphabet after p). These are virtual regions that exist in all chromosomes. These are listed as follows: * Chromatids * Arms * Centromere * Kinetochore * Telomere * Sub telomere * satellite chromosome or trabant. * NOR region