"

 How many chromosomes per cell? 

I'm no expert so I've not gone in and edited the following statement from the article, but it seems 'odd' to me as it flies in the face of everything I've ever been taught about chromosomes:

 ...each male cell contains only one X or one Y chromosome, but not both. (This is true for nearly all male cells not just sperm cells).

...that's from the section ""Whose genome was sequenced?""

My understanding was that all male cells had 46 chromosomes (except for sperm).

So am I ill-informed or if not could someone correct that sentence to whatever it should have been?  "