Mitosis







Interphase - Cell is fully grown and organelles(not shown) duplicate. Chromosomes...


...coil and duplicate.


Prophase - Nuclear envelope dissapears and spindle (the lines) forms from the centrioles.








Prometaphase - Spindle grabs onto the paired chromosomes at the centromeres.


Metaphase - Spindle pulls the pairs into a line along the center of the cell.


Anaphase - Paired chromosomes are pulled apart and each one is pulled towards the opposite pole. Along the way, they...








...fall off the spindle.


Telophase - Spindle disappears, nuclear membrane reappears and...


...the cell divides into two daughter cells. Mitosis is complete.


Meiosis - Sperm







Metaphase - The beginning of meiosis is similar to mitosis except that the chromosome pairs line up in pairs at metaphase. Right now, the spermatocyte (the cell) is diploid.


Anaphase - Spermatocyte is starting to split.


Telophase - Now haploid, both cells are called Gametes, or reproductive cells.


Meiosis II, Metaphase - Back to metaphase, the chromosome pairs line up along the middle of each gamete.


Anaphase - The gametes start to split.


Telophase - Now there are 4 spermatatocytes, now called spermatids.


a tail for getting places

Meiosis - Ovum







Metaphase - The beginning of meiosis is similar to mitosis except that the chromosome pairs line up in pairs at metaphase. Right now, the spermatocyte (the cell) is diploid.


Anaphase - Unequal division of the cytoplasm is characteristic of this splitting oocyte (the cell).


Telophase - On the left is the secondary oocyte. On the right is the 1st polar body, which may divide again later. It's going to go off somewhere while I show you the rest of the pictures.


Meiosis II, Metaphase - The haploid oocyte's chromosomes line up along the center.


Anaphase - Another unequal division to create an ootid and another polar body.


Telophase - The haploid ootid known as an ovum.