Chromosomal aberration - Definition

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A chromosomal aberration is when the structure or the number of chromosomes is abnormal. Part of a chromosome can be moved, forgotten, or reversed. This may affect the sex chromosomes as well as non-sex chromosomes (or autosomes). These abnormalities can be detected on a karyotype (photographic representation of the chromosomes of a cell). A chromosomal aberration is often responsible for defects and mental retardation; sometimes it has no negative consequences. You can not cure a chromosomal abnormality.