In humans,the most frequently seen autosomal aneuploid is

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Trisomy 21, also known as Down syndrome, is the most frequently seen autosomal aneuploid in humans. It is characterized by three copies of chromosome 21, leading to developmental delays, intellectual disability, and a range of physical features. Monosomy 21, trisomy 13, and trisomy 18 are also autosomal aneuploidies, but they are much less common than trisomy 21. Tetraploidy, on the other hand, is a chromosomal abnormality in which there are four sets of chromosomes instead of the usual two, and it is extremely rare in humans.

In Humans,the Most Frequently Seen Autosomal Aneuploid Is