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Why Oogenesis Produces One Egg

publish date: 2026/06/17 19:54:25.363420 UTC

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Why does oogenesis result in a single large ovum rather than four equal-sized cells, unlike spermatogenesis?

Because only one meiotic division occurs in females

Because the egg undergoes mitosis instead of meiosis

Because cytoplasm is divided unequally during the meiotic divisions

Because polar bodies are produced through fertilization

Correct Answer

Because cytoplasm is divided unequally during the meiotic divisions

Explanation

During oogenesis, the primary oocyte divides unevenly: the secondary oocyte receives the larger share of cytoplasm, while smaller polar bodies form and eventually disintegrate. This unequal division concentrates resources into one large egg cell, which helps nourish the embryo's early development.

Reference

Biology: A self-teaching guide

Quizzes you can take where this question appears

Gametogenesis & Alternation of Generations