help with bio

[skim1988]

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A developing primary oocyte typically completes meiosis I immediately prior to ovulation. After arresting in metaphase of meiosis II, the developing ovum cannot resume meiosis II until sperm penetration is initiated. Where would you be most likely to find the first polar body produced during the development of an ovum?

Since fertilization occurs at the fallopian tube and meiosis II occurs after fertilization, wouldn't the first polar body be formed there. But the answer to this question is the uterus.

So where does meiosis I and meiosis II take place?

thanks guys!

 

[PooyaH]

hmmmmm, I know the first polar body shows up after ovulation of the egg. Meiosis I occurs during ovulation of the oocyte inside the ovary and then the mature egg inside the follicle (Graffian follicle) is released in the body cavity which is then sucked into the fallopian tube. Now that's where the egg is arrested at metaphase II and won't proceed until fertilization has occurred. By the time meiosis II is completed, the fertilized egg has reached the uterus and that's where you'd see the second polar body. But what I don't get is why it's saying the FIRST polar body is seen in the uterus. The first polar body should be seen at the site of ovulation.

 

[skim1988]

But what I don't get is why it's saying the FIRST polar body is seen in the uterus.

Yea i have no idea. I also put ovary as my answer. It has to be a typo.
Hey pooyah how are you studying for bio?

 

[PooyaH]

Yea i have no idea. I also put ovary as my answer. It has to be a typo.
Hey pooyah how are you studying for bio?

To be honest with you, I've only gone through Cliff's and the destroyer once. I might look over destroyer one more time before my test.

 

[skim1988]

Yea same here. I just started studying for bio a week ago. I'm almost done reading cliffs but haven't even started destroyer. I hope cliffs is enough to get me a score of 20 this coming Monday.

 

[HannibalLecter]

Hey this question is from DATQVault and I want to briefly go with you about why the answer is as stated:

The answer is the endometrium of the uterus why because the polar body even though it is produced in the ovulation stage of oogenesis when it is about to be released from the ovary and into the abdominal cavity, the polar body never actually leaves the egg. This is the same principle as endosperm (3n) forming inside of an egg when plant male gametes fertilize the egg cell inside the ovary. The polar bodies stay inside the ovary with the egg and so do the polar bodies inside the eggs of humans. Since the polar body remains in the egg the entirety of when its getting fertilized/implanted it is going to remain within the egg when it is implanted into the uterus.

 

[jwnichols21]

Hey this question is from DATQVault and I want to briefly go with you about why the answer is as stated:

The answer is the endometrium of the uterus why because the polar body even though it is produced in the ovulation stage of oogenesis when it is about to be released from the ovary and into the abdominal cavity, the polar body never actually leaves the egg. This is the same principle as endosperm (3n) forming inside of an egg when plant male gametes fertilize the egg cell inside the ovary. The polar bodies stay inside the ovary with the egg and so do the polar bodies inside the eggs of humans. Since the polar body remains in the egg the entirety of when its getting fertilized/implanted it is going to remain within the egg when it is implanted into the uterus.

But I thought that it degenerates? Cliffs says each time they talk about polar bodies that they basically just disintegrates. So, if it travels with the egg to the uterus, when does it actually disintegrate?