The vast majority of XXY males do not produce enough sperm to allow them to become fathers. ...
Thanks for your reply.
I did follow your link, and after a quick reading I'm still not sure what an XXY male is. Is this someone who has a chromosome triplet?
I am not arguing that abnormal chromosome counts are not harmful in these instances, but they do happen and they are not fatal.
I never suggested that everyone with abnormal chromosome sets dies prematurely. For evolution, the issue is not survival (despite Darwin) but the ability to reproduce. One of the reasons the Internet exists is that researchers who produced abnormal fruit flies needed to be able to communicate with others who had produced similar abnormalities to have a chance to breed them. To the best of my knowledge all such human engineered rendezvous have failed. That is: the little abnormal fruit flies lived, but never produced offspring.
Without the ability to reproduce, genetic change via mutation cannot result in evolution.
ML/NJ
Did you read beyond the first sentence of my post, or have you read any of the other relevant posts?