Aneuploidy resulting from loss of a single chromosome.
Viable monosomies are quite a bit rarer than viable trisomies among humans, presumably because too few genes, in terms of gene expression, is worse than too many (i.e., too little gene expression worse than too much). That is, see, however, dosage compensation.
Turner syndrome (monosomy X) is the sole human monosomy with signficant viability.
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