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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Some sperm mitochondria enter an egg during fertilization, but as sperm nature these mitochondria are tagged with a protein (ubiquitin) that marks them for destruction. What organelle carries out this destruction process?

Summary Introduction

To explain: The cell organelles that carry out the destruction of ubiquitin-tagged mitochondria of the sperm.

Concept introduction: The sperm only gives the pronucleus to the zygote. The egg only gives the mitochondria, cytoplasm, and the pronucleus to the zygote. Also, the mitochondria have the DNA to produce proteins that are necessary for oxidative phosphorylation.

Explanation
As spermatogenesis occurs, most of the cell organelles are removed. Only the Golgi complex as acrosomes, nucleus, and mitochondria with centrosome is retained in the spermatid. As oogenesis occurs, the cell organelles remain as such. As spermiogenesis progresses, the mitochondria are given ubiquitin tags that signal that the organelle should be degraded...

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