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An organized structure which encodes genes which are the body's code for characteristics such as hair color or gender. Human cells have 23 pairs of chromosomes (total of 46 chromosomes). Cancer or leukemia cells often have a chromosomal abnormality which is a change to their chromosomes, such as a chromosomal duplication or an extra chromosome (47 chromosomes) or have a chromosomal deletion or a loss of a chromosome (45 chromosomes). A chromosomal or genetic inversion is when no extra chromosomes are added or deleted, but instead a portion is backwards. In the word 'bdrawkcas', the middle has been inverted.