Which one of the following syndrome is the result of meiotic non dysjunction?

Explanation

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate during meiosis, producing gametes with abnormal chromosome numbers. It can produce an extra X chromosome in Klinefelter syndrome, a missing X chromosome in Turner syndrome, or an extra chromosome 21 in Down syndrome. Students may choose only Down syndrome because it is the most commonly cited example, but all three can result from meiotic nondisjunction.