An amimal cell has: Cell Membrane, cytoplasm, nucleus, Endoplasmic Reticulum, Ribosomes, Golgi Bodies, Mitochondria, Vacuoles, Cell Wall and Chloroplasts...
jueves, 12 de marzo de 2009
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
jueves, 29 de enero de 2009
Cells...Mitosis
A cell is the smallest living organism and it is often called the building block of life.
Cells divide by mitosis.
Cells divide by mitosis.
Mitosis is a process which results in the production of two daughter cells from a single parent. The daughter cells are identical to one another and to the original parent cell.
Interphase: The cells cromosomes duplicate and the nuclkeus is clearly visible.
Prophase: Each chromosome has duplicated and now consists of two sister chromatics. The nuclear envelope breacks down into vesicles.
Prophase: Each chromosome has duplicated and now consists of two sister chromatics. The nuclear envelope breacks down into vesicles.
Metaphase: The chromosomes align at the equitorial plate and are held in place by microtubles attached to the mitotic spindle and to part of the centromere.
Anaphase: The chromosomes have separated.
Telephase: The cytoplasm is begining to separate.
http://www.accessexcellence.org/RC/VL/GG/mitosis.php
http://www.enchantedlearning.com/subjects/plants/cell/anatomy.GIFhttp://kvhs.nbed.nb.ca/gallant/biology/mitosis_phases.jpg
http://www.enchantedlearning.com/subjects/plants/cell/anatomy.GIFhttp://kvhs.nbed.nb.ca/gallant/biology/mitosis_phases.jpg
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