Contrast spermatogenesis and oogenesis. What is the significance ...

Question

Contrast spermatogenesis and oogenesis. What is the significance of the formation of polar bodies?

Accepted Answer

Welcome back everyone. Let's look at our next question which of the following is correct about polar bodies. Well let's just recall where polar bodies come from a quick diagram here and they're from that process of O genesis. You have a primary oocyte that goes through my aosis one and two. And as you expect you do produce four daughter cells but in this case because the cytoplasm is going to be necessary and the organelles are gonna be necessary to for the nourishment and for the development of the zygote. Um You have an asymmetrical division so that you would end up with just one functioning ovum here that will go on to be fertilized and the other the products is uneven division um will eventually sort of disintegrate through apoptosis. So we see our primary oocyte here with the chromosome number of two N. Which goes through that first round of mitosis, producing two daughter cells with the coated. This larger cell that gets all the cytoplasm and organelles. And then the very small first polar body. This may divide, go on to divide the 02 goes on to divide giving you your final ove. Um We see large here with its single halfway number of chromosomes and a second polar body along with the first polar body divides will end up with the other two giving us that four daughter cells. Again these three small polar bodies that go on to sort of disintegrate and be lost and R. Ove um which can be fertilized. So as we remind ourselves of that. Let's go through our answer choices. And let's note that choice D. Is all of the above. So there's a possibility that all of these could be correct. So the first choice A says polar bodies are products of sperm A. Genesis and oh genesis um this is not correct. They are not products of Permata genesis. Permata genesis produces four identical in size um happy Lloyd cells. So only O genesis. So choice A. Is not correct. It also eliminates choice D. As we're not going to have all of them being correct. Choice B. Is the eventual fate of the polar bodies is a apoptosis. Um This is correct. They will eventually disintegrate by means of apoptosis. So we'll go ahead and highlight that here. That's our answer choice. And then finally we have choice C. Choice C says polar bodies deliver nourishment to the fertilized ovum slash zygote. Well this is not correct. Um It's the cytoplasm that provides that nourishment. Polar bodies are thought to deliver nourishment to the mature ovum but not the fertilizer. Them not the zygote. So that's an incorrect statement. So eliminate choice C. So again which the following is correct about polar bodies. Choice be the eventual fate of the polar bodies is apoptosis. Hope to see in the next video

Contrast spermatogenesis and oogenesis. What is the significance of the formation of polar bodies?

Key Concepts

Spermatogenesis

Oogenesis

Polar Bodies

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