Differentiation into male or female: This determines the gametes (sperm or eggs).

Sexual maturation: Puberty triggers the ability to produce viable gametes.

Production, storage, and release of gametes: The body must create, store, and release enough eggs or sperm for fertilization.

Correct chromosome number in gametes: Eggs and sperm must contain half the genetic material (haploid) to form a complete embryo when combined.

Gametes must meet: Sperm must reach the egg for fertilization.

Creation of a new embryo: The combination of genes from both parents results in a unique embryo.

Nurturing of the embryo: The embryo must be supported until it can develop into an independent organism.

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