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(cell and molecular biology)
The presence in triplicate of one of the chromosomes of the complement.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
This scan looks for physical abnormalities and 11 rare conditions, including Edwards' and Patau's syndromes. What are the risks?
The fluid contains cells from the baby, which are tested for Down's, Edwards' or Patau's syndromes.
The NHS report more than nine out of 10 children born with Patau's syndrome die during the first year.
The Welsh Government said the blood test, available from Monday, is a safer and more accurate screening for Down's, Edward's and Patau's syndromes.
Those who show a high chance of genetic conditions such as Down's, Edwards' and Patau's syndromes were offered the invasive tests.
Those who show a high chance of their baby developing genetic conditions such as Down's, Edwards' and Patau's syndromes are offered the invasive tests, which often involve taking a sample from the womb.
"We don't know how good the test is for other genetic conditions - Edwards' and Patau's syndromes - that are currently part of the programme...