Chromosomal aberration (chromosomal mutation) - disorder involving the change in structure or number of chromosomes. For chromosome aberrations can occur spontaneously or under the influence of mutagenic agents (eg ionizing radiation, ultraviolet radiation, high temperature). Aneuploidy and poliploidie runs are due to incorrectly process of separation of chromosomes during cell division. At the level of the whole human organism (ie, almost every nucleated cell of the body should include This shift) the vast majori