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XO/XX Mosaicism in a Pair of Presumably Monozygotic Twins with Different Phenotypes
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1963
Year
BiologyMendelian DisorderXo/xx MosaicismCytogeneticsMedicineGeneticsGenetic DisorderGynecologyBlood GroupingChromosome BiologyMolecular GeneticsGenetic VariationChromosomal RearrangementMonozygotic TwinsMosaicismDifferent PhenotypesTwin SistersPresumably Monozygotic Twins
Blood grouping of a pair of twin sisters rendered it probable that they are monozygotic twins. One was severely mentally retarded and had a number of signs of Turner’s syndrome. This twin later died. Autopsy revealed normal ovaries. The other twin is phenotypically normal. In both twins XO/XX sex chromosome mosaicism was demonstrated.