Allosome (allosoma), any chromosome that behaves differently from the autosomes, and is a modification of the latter.
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allosome
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Originally: any chromosome distinguished from ordinary chromosomes by some feature of appearance or behaviour; (in later use) spec. a sex chromosome (in a species with heterogametic sex determination). (OED 2012)
- 1906
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Montgomery, T.H. Jr. (1906). Chromosomes in the spermatogenesis of the Hemiptera Heteroptera. Trans. Amer. Philos. Soc. 21, 97-173: 97.