trisomic

[trahy-soh-mik]
adjective Genetics.
having one chromosome in addition to the usual diploid number.

Origin:
trisome + -ic

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trisomy (ˈtraɪsəʊmɪ)
 
n
the condition of having one chromosome of the set represented three times in an otherwise diploid organism, cell, etc. Trisomy of chromosome 21 results in Down's syndrome
 
[C20: from tri- + (chromo)som(e) + -y³]
 
trisomic
 
adj

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Example sentences
The progenies of these plants were studied and they produced diploid and simple trisomic plants.
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