1) Unpaired X-chromosome 
1. <molecular biology> A single ribosome attached to a strand of mRNA. ... 2. <cell biology> A ribosome that has dissociated from a polysome. ... 3. Chromosome in an aneuploid set that does not have a homologue. ... (18 Nov 1997) ... 
(1) A single ribosome attached to a strand of mRNA. (2) A ribosome that has dissociated from a polysome. (3) Chromosome in an aneuploid set that does not have a homologue.
Type: Term Pronunciation: mon′ō-sōm Definitions: 1. Obsolete term for ribosome. 2. A structure consisting of a single ribosome bound to a molecule of mRNA. Synonyms: accessory chromosome
a chromosome having no homologue, esp. an unpaired X chromosome. · a protein-synthetic complex involving the translation of a messenger RNA molecule by a single ribosome. · a monosomic individual.