Chances for Male/Female

Why is it a 50-50 chance that a baby will be a boy/girl rather than something else, like 55-45, etc.?

>>32
Again, not answering the question, just restating it. There's no inherent reason for all outcomes to have the same probability.
The question has already been answered in this thread, but holy fuck, that's a very, very basic error.

No wonder mathematicians look down on biologists.