Question about sperm and egg?

What exactly does the sperm add to the egg during fertilization? I know
that each Sperm has 23 chromosomes. But is that all that is passed to
the child from the father? The egg it self is what humans are made of
correct? I just don't see how humans can be equally half of the mother
and half of the father. The egg is 1000 times bigger than the sperm. So
that means that the egg is the fabric that humans are made of. The
sperm just offers a design on that fabric correct?


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