The correct answer is: Klinefelter syndrome (KS) or XXY syndrome.
This syndrome usually occurs randomly and it may come in different forms:
• When there is an extra X chromosome in each cell
• When there is an extra X chromosome in some cells (mosaic Klinefelter)
• When there is more than one extra X chromosome.
Men with this syndrome often don’t have visible symptoms but can also lead to infertility. On the other hand, some of them have symptoms such as weaker muscles, greater height, less body hair, breast growth…
