A condition that is caused by nondisjunction of autosomal chromosomes. a) XO – Turner syndrome b) Trisomy 21- Down syndrome c) XXY-Kleinfelter syndrome d) Trisomy X-Meta female

The answer is b) Trisomy 21 - Down syndrome. Nondisjunction is the failure of chromosomes to separate properly during meiosis, resulting in an abnormal number of chromosomes in the daughter cells. Down syndrome is caused by the presence of an extra copy of chromosome 21, which is a result of nondisjunction during meiosis. This leads to an individual having three copies of chromosome 21 instead of the normal two. This condition can cause developmental delays, intellectual disability, and other health issues. The other options listed are also caused by chromosome abnormalities resulting from nondisjunction, but they involve different autosomal and sex chromosomes.