Whether a baby is male or female is determined by the sperm, not the egg.

And choosing the gender of your baby doesn't have much to do with DNA if I remember right, they just separate the sperm into "likely" groups of female and male. It isn't even 100% right, just a try at it. I think it's 96% correct. Then again I was looking into this stuff about a year ago, it could have changed since then.

Me and Nikki are planning on having that done if we can afford it in any way. We've both pretty much agreed that little boys are a bit too crazy. Not that we wont be happy with one if we get one.