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Ultimately, gametes must accomplish their purpose: passing on the genes, the instructions for life, from one generation to another.Thus, we turn our attention in the next chapter to the next steps of fertilization, embryogenesis, and birth.
It serves us no good as a species to form sex cells if the cells cannot interact to form another human.
The restriction point, during which the DNA is checked for quality, must be passed for the cell to move into the S stage. The strands of DNA, called chromatids, are held together at the centromere.
o In the G2 stage (postsynthetic gap), there is further cell growth and replication of organelles in preparation for mitosis.
Another quality checkpoint must be passed for the cell to enter into mitosis.
o In the M stage (mitosis), mitosis and cytokinesis occur.