The only thing contributed to the egg by the fertilizing sperm is the nucleus of the sperm.

Name: The only thing contributed to the egg by the fertilizing sperm is the nucleus of the sperm.
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The sperm contributes not only its nucleus, which contains half of the genetic material necessary for the development of the embryo, but also a centriole, which is crucial for the first cell division after fertilization.

The Only Thing Contributed to the Egg by the Fertilizing