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(cell and molecular biology)
The presence in triplicate of one of the chromosomes of the complement.



the presence of one or a few nonhomologous extra chromosomes in the chromosome set of a diploid organism. Organisms (or cells) in which one, two, or more chromosomes present themselves as three homologues are called simple trisomics, double trisomics, and so forth. Trisomy is caused by the failure of chromosomes to separate (nondisjunction) during cell division. Some specific severe disorders are the result of trisomy occurring in specific chromosomes.

References in periodicals archive ?
Dr Anne Mackie, Director of Programmes for the UK NSC, supported by Public Health England, said: 'Edward's Syndrome and Patau's Syndrome can be detected through a scan, which is currently offered to all women between 18 and 20 weeks of pregnancy in England as part of the NHS Fetal Anomaly Screening Programme.
Other chromosomal abnormalities, such as Patau's syndrome or Edwards syndrome, are also more common in older mums.
He had been suffering from Patau's Syndrome, which means he had an extra chromosome.