trisomy

An additional copy of a chromosome so that there are three copies not two in a diploid organism. Best known example is trisomy 21 in Down's syndrome.

Trisomy

A trisomy is a type of polysomy in which there are three instances of a particular chromosome, instead of the normal two. A trisomy is a type of aneuploidy (an abnormal number of chromosomes). ==Description and causes== Most organisms that reproduce sexually have pairs of chromosomes in each cell, with one chromosome inherited from each parent. In...
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trisomy

(from the article `chromosomal disorder`) ...Twenty-two of the pairs are autosomes, and one pair, number 23, is the sex chromosomes. Any variation from this pattern causes abnormalities. A ... The most common form of aneuploidy in humans results in Down syndrome, a suite of specific disorders in individuals possessing an extra chromosom...
Found on http://www.britannica.com/eb/a-z/t/82

trisomy

(tri´so-me) the presence of an additional (third) chromosome of one type in an otherwise diploid cell (2n + 1). adj., triso´mic., adj.
Found on http://www.encyclo.co.uk/local/21001

trisomy

[n] - chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
Found on http://www.webdictionary.co.uk/definition.php?query=trisomy

trisomy

<genetics, molecular biology> Term which indicates the presence of an additional whole chromosome. Each cell usually has 46 but in trisomy this is increased to 47. ... (13 Nov 1997) ...
Found on http://www.encyclo.co.uk/local/20973

trisomy

noun chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
Found on https://www.encyclo.co.uk/local/20974

Trisomy

A condition where a cell has an extra chromosome.
Found on http://www.superglossary.com/Glossary/Science/Biology/

trisomy

Possessing three copies of a particular chromosome instead of the normal two copies.
Found on http://www.daviddarling.info/encyclopedia/T/trisomy.html

Trisomy

Possessing three copies of a particular chromosome instead of the normal two copies.
Found on http://www.encyclo.co.uk/local/22391

Trisomy

Possessing three copies of a particular chromosome instead of the normal two copies.
Found on http://www.ornl.gov/sci/techresources/Human_Genome/glossary/glossary.shtml

Trisomy

the presence in the cells of three copies of a certain chromosome instead of the normal two copies
Found on http://www.medichecks.com/glossary.cfm?ltr=T

Trisomy

the presence of one extra chromosome. See Aneuploidy.
Found on http://www.cat-world.com.au/glossary

Trisomy

The presence of three chromosomes of one type instead of the normal two.
Found on http://www.encyclo.co.uk/local/21429

Trisomy

Trisomy: The presence of three copies of a chromosome rather than the normal two. The most common trisomies in newborns are trisomy 13 (Patau syndrome), trisomy 18 syndrome (Edwards syndrome) and trisomy 21 (Down syndrome). The most common trisomy among spontaneous abortions is trisomy 16. See also: Recurrent trisomy.
Found on http://www.medterms.com/script/main/art.asp?articlekey=38317

trisomy

Type: Term Pronunciation: trī′sō-mē Definitions: 1. The state of an individual or cell with an extra chromosome instead of the normal pair of homologous chromosomes; in humans, the state of a cell containing 47 normal chromosomes. For various types of trisomy syndrome, see entries under syndrome.
Found on http://www.medilexicon.com/medicaldictionary.php?t=94079
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