What causes disorders such as klinefelter syndrome and turner syndrome?

What causes disorders such as Klinefelter syndrome and Turner syndrome ?
- non disjunction of sex chromosomes
Turner syndrome, and Klinefelter syndrome constitute the most common chromosomal abnormalities.
In males, the presence of an extra x-chromosome (47, XXY) results in a condition known as Klinefelter syndrome.
- type of sex chromosome abnormality Klinefelter syndrome