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accessory chromosome

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ac·ces·so·ry chro·mo·some

a supernumerary chromosome that is not an exact replica of any of the chromosomes in the normal cellular complement.
Synonym(s): monosome (1) , odd chromosome, unpaired allosome, unpaired chromosome
Farlex Partner Medical Dictionary © Farlex 2012

accessory chromosome

an extra CHROMOSOME (supernumerary) above the normal number for the SPECIES. Accessory chromosomes are HETEROCHROMATIC chromosomes that have only minor biological roles, if they have any. They have been called satellite chromosomes. See B CHROMOSOMES.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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