Question

which of these is a common autosomal aneuploidy?
○ turner syndrome
○ xxy
○ klinefelter syndrome
○ down syndrome

Explanation:

Aneuploidy refers to an abnormal number of chromosomes in a cell. Down Syndrome is caused by an extra copy of chromosome 21 (autosomal aneuploidy). Klinefelter Syndrome (XXY) and Turner Syndrome (XO) are related to sex - chromosome aneuploidy.

Answer:

Down Syndrome