In genetics, having two copies of a particular chromosome instead of the normal number.
From dis- (two) + -somic (relating to chromosomes), from Greek soma 'body.' The term specifically describes the chromosomal composition of a cell.
Disomic describes a trisomy-like condition but with different mechanisms—in plants especially, you might see disomy where cells have two copies of a chromosome when they should have one. It's how geneticists describe unusual chromosomal states with precision.
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