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Answer:The most common type of chromosomal abnormality is known as aneuploidy, an abnormal chromosome number due to an extra or missing chromosome.

Explanation:Most people with aneuploidy have trisomy (three copies of a chromosome) instead of monosomy (single copy of a chromosome).

gizzygizmo606
the chromosomal abnormality that results from this is known as aneuploidy due to either a missing or extra chromosome people who have extra chromosomes would have trisomy