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.Actually, no. I missed this. But looking at it now I see that the next paragraph discusses XXY/XY males which I guess means guys who have a mixture of normal cells and abnormal cells. So I wonder if all of the XXY folks or at least those who have fathered children have some small number of normal cells.
The questions of importance for this discussion though, are: was there anything remarkable about the structure of the mothers' cells; and what was the genetic makeup of the cells of the children. And don't tell me to go do my own research. You cite this XXY stuff as being relevant to the discussion so I would assume you have some knowledge beyond what you heard in a bar last week, and can pass it on.
As for post #327, I do not understand how it addresses either of the questions I raised with the professor. Perhaps you could explain.
ML/NJ
You started the discussion of chromosome count inpost #161 with this:
Then I asked whether he believes in chromosomes, which of course he did. So I asked him how we evolved from 22 chromosome pairs to 23 chromosome pairs gradually. He didn't even try to answer.
I assume you were challenging the assumption that a species could have members with differing chromosome counts and still interbreed with viable offspring. Lots of species do, as indicated in post #327.
Humans do not show the same degree of variability in chromosome count, but it does exist and does not always result in retardation or sterility.
Particularly interesting is the mosaic count, since it directly applies to your question about evolution.