jueves, 19 de febrero de 2009

Meiosis...



Meiosis: A process of reductional division. When meiosis begins, the DNA in the original cell is replicated. It occurs in all eukaryotes.
Meiosis 1: is the same as mitosis.
Meiosis 2:
Prophase II: We see the disappearance of the nucleoli and the nuclear envelope again as well as the shortening and thickening of the chromatids.
Metaphase II: centromeres contain two kinetochores that attach to spindle fibers from the centrosomes (centrioles) at each pole.
Anaphase II: where the centromeres are cleaved.
Telophase II: uncoiling and lengthening of the chromosomes and the disappearance of the spindle.
That is when an organism forms...!

http://en.wikipedia.org/wiki/Meiosis
http://www.biology.iupui.edu/biocourses/n100/images/meiosis2cropped.jpg