This can happen as a result of nondisjunction of sex chromosomes during meiosis, and it happens more frequently in sperm cells - but egg cells can also be affected.

这可能是由于细胞在减数分裂期间性染色体未分离而造成的，而且这一情况在精子细胞中发生得更频繁，不过在卵细胞中也可能出现。