I've been wondering for some time, but say that my mother's egg chose another sperm cell, and a baby was eventually produced. Would I still be born, but end up with different characteristics/features?
closed as unclear what you're asking by terdon, Memming, Satwik Pasani, WYSIWYG, jonsca Oct 5 '13 at 7:27
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For every sperm that fertilises an egg there are millions/billions/"a sh**load" that don't make it. Within that pool of unused sperm there is considerable genetic variation. If we assume that DNA is the only factor which makes "you you" then the chance of picking one of those sperm and it having the exact same DNA is small. Of course environment also has a large effect so even two identical sperm and egg combinations would produce two people with different physical and mental attributes.
If this does not answer your question then this is not really a biological question though and should really be on the philosophy SE.