Could you provide some addition information? I would especially be interested in information about whether there is any known case of a non-23-pair-human producing a child?
ML/NJ
The vast majority of XXY males do not produce enough sperm to allow them to become fathers. If these men and their wives wish to become parents, they should seek counseling from their family physician regarding adoption and infertility.I am not arguing that abnormal chromosome counts are not harmful in these instances, but they do happen and they are not fatal. There are instances in other species where changes in chromosome count have no harmful effects.However, no XXY male should automatically assume he is infertile without further testing. In a very small number of cases, XXY males have been able to father children.
In addition, a few individuals who believe themselves to be XXY males may actually be XY/XXY mosaics. Along with having cells with the XXY chromosome count, these males may also have cells with the normal XY chromosome count. If the number of XY cells in the testes is great enough, the individual should be able to father children.
Karyotyping, the method traditionally used to identify an individual's chromosome count, may sometimes fail to identify XY/ XXY mosaics. For this reason, a karyotype should never be used to predict whether an individual will be infertile or not.