I will talk to a few friends who study Biology religiously. But I think there is something in the makeup of the membrane of both ova and sperm that prevent this theory from taking place.

An fertilized egg can split after fertilization (or partially split), this is the result of identical or conjoined (Siamese) twins.
I am almost certain that one sperm cannot penetrate another. However it may be possible for two sperm to enter the ova at EXACTLY the same time. However, nature may have a way to control this. This may result in a dead embryo, or ova if fertilization doesn't happen first.

It is definately interesting and worth discussing.

Also, a sperm carries half the chromosomes to make an organism, the ovum carries the other half. If two Sperm are in the same egg, they both cannot contribute their half. Either only one would be functional, or they each would contribute a part (which I do not think is possible).

This stuff is fun

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