The detection of a familial translocation, t(10;18)(p12;q22), has made possible the observation in type and countertype of two related persons with opposite chromosomal imbalance: trisomy 18q22----18qter with monosomy 10p12----10pter in one of the two and monosomy 18q22----10pter in the other. In each case the abnormalities attributable to monosomy overrule those attributable to monosomy overrule those attributable to the associated trisomy.
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