Question with Meiosis?

Question

I know how meiosis seperates into four sex cells with half the amount of chromosomes so that the offspring (after combined with sex cell of the opposite gender), will have 46 chromosomes. What I don't get is...

>> In females... after it splits...one egg with 23 chromosomes results. Then how can more meiosis form, since theres only one egg with only 23 chromosomes now??

If the above doesn't make sense, here's my question::

You know how in the endl, meiosis ends up with 4 haploid cells with half the amt of chromosomes from the original cell?

How is the original cell formed in the first place? Cuz the original is supposed to have 46 chromosomes

But meiosis only ends up with 4 cells with 23 chromosomes.

Answer 1

Women are born with all the cells that will ever go through meiosis.

In other words, it isn't the same cell going through meiosis many times, but rather many many cells going through meiosis ONCE.

So women are born with about 10,000 cells that could ever possibly go through meiosis, and only a few (relatively) ever go through it once.

Meiosis produces two "n" number chomosome cells from the first meiosis split.

One Cell with "2n" number of chromosomes
splits by Meiosis 1 into
Two Cells with "n" number of Chromosomes
splits by Meiosis 2 into
A TOTAL of four cells with "n" number of Chromosomes

So no, meiosis does not reproduce the 2n cell into two daughter 2n cells. A cell destined to go through meiosis can only do it once, and in women it does NOT go through mitosis first.

Answer 2

See you can divide Meiosis into Meiosis 1 and Meiosis 2 .

The first phase is of reductional division that is the chromosome numbers halve basides the basic process of crossing over.so here the chromosome number halves to 23.
The phase 2 is much like mitosis involving division such that the chromosome number remains the same.
But mind you , in females its like meiosis starts when the girl is in mothers womb only and it stops before birth itself and all the ovaries which will ever be produced are already made.These are arrested in metaphase and released after 28 days approximately and resume division once the Sperms are received. then the normal division using mitosis gives the original organism and diploid condition is restored .
Also in females only one of the two cells are made after meiosis one survives while the secondary oocyte does not develop any further.
In males the process is simple (the one you have stated in the question.)i.e. all four cells proceed for further maturation.

Answer 3

The original cells that gametes are made from after meiosis are a bunch of semi specific 46 chromosomes stem cells that can give rise to gametes. Each meiosis starts with one of those 46 chromosomes stem cells and produce 4, haploid gamet cells. Once a gamet is formed it can't go through any meiosis (or mitosis) until it has fused with another gamete cell, from the opposite sex and formed a zygote.

Answer 4

They are processes of cell division. I'm studying it too, hope this helps: Interphase the the busiest phase where the cell copies its DNA and gets ready for cell division of mitosis or meiosis (and before mitosis starts). In mitosis the phases go as follows: 1.)prophase 2.)metaphase 3.)anaphase and 4.)telophase In meiosis the phases go as follows: 1.)interphase 2.)prophase I 3.)metaphase I 4.)anaphase I 5.)telophase I 6.)prophase II 7.)metaphase II 8.)anaphase II and 9.)telophase II....1.) to 5.) are the 1st part of meiosis called Meiosis I and 6.) to 9.) are the second part called Meiosis II.

Answer 5

A normal cell starts with 46 chromosomes.
Before Meiosis begins the cell goes through replication and now has 92 chromosomes.
During Meiosis I there is recombinations and such and the cell divides into two cells with 46 chromosomes each. Then during Meiosis II the cell divides again without replicating its DNA so each gamete ends up with 23 chromosomes.

Answer 6

At the beginning of meiosis the process is much like mitosis in that the chromsomes replicate like they will form two diploid cells. Then there is enough genetic material to form 4 haploid cells.