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An oogonium (plural oogonia) is an immature ovum.
polar bodies
The oogenesis of a rat is the period of time in a female when the ovum is immature. The process begins with oocytogenesis and ends with a mature ovum.
sperm are made from the male reproductive system, ovum is a immature egg developed in the ovary of a female
gametes, sex cells, haploid cells. the process is meiosis.