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Multiple Choice

Oogenesis yields three polar bodies

The question tests how oogenesis handles meiotic divisions to allocate cytoplasm to the developing oocyte. During oogenesis, the divisions are highly unequal, so most cytoplasm stays with one large cell that becomes the ovum, while the extraneous nuclei are discarded as polar bodies. First division yields a large secondary oocyte and a small first polar body. The second division yields a mature ovum and a second polar body. In some cases, the first polar body may also divide, producing two additional polar bodies. Altogether, this can result in three polar bodies formed from one original oocyte. That’s why three polar bodies is the best answer: polar bodies are byproducts of meiosis in oogenesis, and multiple divisions can lead to more than one polar body, but typically not more than three. The other options don’t fit because you would either expect at least two polar bodies overall, you wouldn’t expect zero, and you wouldn’t normally get four polar bodies from standard oogenesis.

The question tests how oogenesis handles meiotic divisions to allocate cytoplasm to the developing oocyte. During oogenesis, the divisions are highly unequal, so most cytoplasm stays with one large cell that becomes the ovum, while the extraneous nuclei are discarded as polar bodies.

First division yields a large secondary oocyte and a small first polar body. The second division yields a mature ovum and a second polar body. In some cases, the first polar body may also divide, producing two additional polar bodies. Altogether, this can result in three polar bodies formed from one original oocyte.

That’s why three polar bodies is the best answer: polar bodies are byproducts of meiosis in oogenesis, and multiple divisions can lead to more than one polar body, but typically not more than three.

The other options don’t fit because you would either expect at least two polar bodies overall, you wouldn’t expect zero, and you wouldn’t normally get four polar bodies from standard oogenesis.