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Answer:
S phase is called as DNA synthesis phase.
In G1 Phase the DNA replication Begins.
During G2 phase cell grow rapidly and protein is synthesized and cell prepares itself for mitosis.
During Mitotic (M) phase, cell division occur.
spermatogenesis is the process during which the production of male sperms occur.
In oogenesis the female egg is produced. Further explanation in attached figures.