Abstract
Although tetraploidy of human chromosomes (92.XXYY) has been described frequently in abortuses, only one example in a live-born infant has previously been described (Golbus <i>et al</i>., 1976). A second malformed infant with a complete tetraploid chromosome complement, which lived for 15 d. is reported. In addition to many of the malformations described in the first case, this infant also had a sacral myclomeningocoele and skeletal anomalies. The probable origin of the tetraploidy was a failure of cytoplasmic cleavage at the first mitotic division of the fertilized ovum.
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