Campbell Reece Biology Website

Campbell Reece Biology Website

Campbell Reece Biology Website

The following articles explore the different types of cell division that are part of the life cycle of all sexually reproducing organisms. There is also information regarding how some organisms can reproduce asexually, without a mate, when cell division results in offspring that are clones.

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Human Life Cycle Mitosis & Meiosis: Sexual Reproduction & Mitotic and Meiotic Cellular Division

It all begins with the fusion of a haploid sperm cell provided by the father and the haploid ovum of the mother. Gametes unite when the nuclei of sperm and egg merge. The fertilized egg that results from the fusion of sperm and egg DNA is called a zygote.