mitotic divisions of oogonia

[sdm33]

In human females, mitotic divisions of oogonia that lead to formation of presumptive egg cells
(primary oocytes) occur between:
A) fertilization and birth only. can some explain it ???? it is confusing? 😕

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[MedPR]

In human females, mitotic divisions of oogonia that lead to formation of presumptive egg cells
(primary oocytes) occur between:
A) fertilization and birth only. can some explain it ???? it is confusing? 😕

Once a female is born, she has already made all of the oocytes for her lifetime. Until puberty they are suspended in a certain phase (can't remember which, but I think it's ana1). At puberty they complete the cycle one per month.

 

[osprey099]

Once a female is born, she has already made all of the oocytes for her lifetime. Until puberty they are suspended in a certain phase (can't remember which, but I think it's ana1). At puberty they complete the cycle one per month.

I think primary oocytes are arrested in prophase 1 until puberty. Once the secondary oocyte is released after ovulation, it is arrested in metaphase 2 until fertilization.

 

[Trayshawn]

mitotic? to my understanding oogonia only underwent meiotic divisions.

 

[Deadlifts]

mitotic? to my understanding oogonia only underwent meiotic divisions.

Formation of oogonia in the time frame this question addresses undergo mitosis.

Basic run down:
Embryo forms -> Gonads differentiate to ovaries (female) -> germ cells differentiate to oogonia --> MITOSIS (millions) --> degeneration, asymmetric division --> primaries get stopped until puberty

 

[DeFused]

I got this question wrong too. I'm still kind of confused why the answer wouldn't be between birth and puberty then?

 

[PlumbLine]

I got this question wrong too. I'm still kind of confused why the answer wouldn't be between birth and puberty then?

Mitosis to form Primary Oocytes is complete before birth. They then begin meiosis. No more mitosis after fetal development.

 

[pacer]

A female baby is born with all the eggs (oocytes) she will need in her lifetime. These oocytes are arrested in prophase I at the time of birth. So they have already gone though mitosis and have started meiosis I. At puberty, each moth, some of these oocytes complete meiosis I and start meiosis II. When they are ovulated, they are arrested in metaphase II. Meiosis II completes only when fertilization takes place but the fusion of nuclei of the egg and sperm takes place once meiosis II completes.