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Etymology: Christchurch, city in New Zealand. An abnormally small, acrocentric chromosome (either chromosome 21 or chromosome 22), in which the short arm is missing or partially deleted. The aberration is associated with chronic lymphocytic leukemia but has also been found in patients with various other defects. See also Philadelphia chromosome ...

... the material composing the chromosome is compactly coiled, making it visible with appropriate staining and permitting its movement in the cell with minimal entanglement; each organism of a species is normally characterized by the same number of chromosomes in its somatic cells, 46 being the number normally present in humans, including the two (XX or XY) which ...