Are There Any Oogonia In A Mature Female's Ovary?


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Female what?

Female mammal - no
female bird - no
female fish - yes
female insect - yes

The oogonia are the 'stem cells' that divide by mitosis.  In mammals and birds, the oogonia stop dividing very early in development.  For example, in female mammals mitotic division of oogonia stops about half way through fetal life.  The 'eggs' then switch gears and begin the first division of meiosis ... At which point they stall out until that egg is selected to ovulate.

In contrast, in fish and insects (and probably lots of other invertebrates), oogonia continue to divide throughout life, providing a continuous supply of 'fresh' oocytes and follicles.

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