A nurse comments that the only aneuploid conditions he has seen in his practice are Patau syndrome,Edwards syndrome,and Down syndrome.What rationale would the genetics specialist suggest?

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Patau syndrome, Edwards syndrome, and Down syndrome are all caused by aneuploidy of larger chromosomes (chromosomes 13, 18, and 21, respectively). Small chromosomes are less likely to result in viable pregnancy, whereas larger chromosomes may have a greater chance of survival to term. Other aneuploid conditions, such as Turner syndrome (monosomy X) and Klinefelter syndrome (47, XXY), involve small chromosomes and may not be as commonly seen in clinical practice.

A Nurse Comments That the Only Aneuploid Conditions He Has