Friday, February 13, 2009
M-E-I-O-S-I-S
This week in sceinnce, we finished learning on how Meiosis works and started Genetics. On Monday, we learnt that Meiosis is really related to Mitosis. We also learnt that when a sperm cell and an egg cell meet and come together, It is called a Zygote. Then, we went on this website and saw how the DNA gets into the sperm cells. That website was very helpful in learning how the DNA gets spread out. Next, we wraped up our celluar reproduction with a quiz on the Meiosis and Mitosis. And on Friday, we went on this website and learnt about Gregor Mendel and how he breeded peas and how he found ou thow we lok like our parens.
Sunday, February 8, 2009
Meiosis
This week in science, we learnt about the process of meosis and how it relates to mitosis.
The first stage of meiosis is:
Interphase I: Whe the cell goes through its normal life.
Prophase I: The centrioles pull apart the one
Metaphase I: the chromosomes or homolagues pairs line up on the metaphase plane and are ready to be seperated by the centrioles.
Anaphase I: During anaphase I, the cell's spindle fibers pull the chromosome pairs and start to go to opposite poles.
Telephase I: During telephase I, the cell's nucleas starts to reform and th edaughter cell's nucleas also starts to reform and finishes to reform.
Cytokinesis I: During cytokinesis, The cell's membrane reforms and there are two indevidual cells now.
Meiosos II
Interphase IIDuring Interphase two, the cell's centrioles come and surround the nucleas and start producing spindle fibers.
Prophase II: (Interphase II)
Metaphase II: During Metaphase II, the cell's chromosomes line up ready to be seperated.
Anaphase II: During Anaphase II, the cell'schromosomes are pulled apart just like meiosis.
Telophase: During Telophase II the cell's membrane starts to close off creating 4 new cells. Then the nuclear membrane reforms.
Cytokinesis II: During cytokinesis II, the cell's break off from each other creating 4 sperm cells.
The first stage of meiosis is:
Interphase I: Whe the cell goes through its normal life.
Prophase I: The centrioles pull apart the one
Metaphase I: the chromosomes or homolagues pairs line up on the metaphase plane and are ready to be seperated by the centrioles.
Anaphase I: During anaphase I, the cell's spindle fibers pull the chromosome pairs and start to go to opposite poles.
Telephase I: During telephase I, the cell's nucleas starts to reform and th edaughter cell's nucleas also starts to reform and finishes to reform.
Cytokinesis I: During cytokinesis, The cell's membrane reforms and there are two indevidual cells now.
Meiosos II
Interphase IIDuring Interphase two, the cell's centrioles come and surround the nucleas and start producing spindle fibers.
Prophase II: (Interphase II)
Metaphase II: During Metaphase II, the cell's chromosomes line up ready to be seperated.
Anaphase II: During Anaphase II, the cell'schromosomes are pulled apart just like meiosis.
Telophase: During Telophase II the cell's membrane starts to close off creating 4 new cells. Then the nuclear membrane reforms.
Cytokinesis II: During cytokinesis II, the cell's break off from each other creating 4 sperm cells.
Sunday, February 1, 2009
Mitosis(Cell reproduction)
Over the week at science, we did a lot of theings. Here is what we did:
On monday, we talked about the things that happen mitosis and the stages/phases that occur during Mitosis.
Interphase-the phase that the cell stays in and when the cell copies the DNA/chromosomes for reproducton.
Prophase- Is when the nuclear envelope wears away exposing the sister chromotids.
Metaphase- When the cell's centrioles use the spindle fibers to pull apart the sister chromotids.
Anaphase- Is when the cell's centrioles seperate the sister chromotids and go to the other ends of the dividing cell.
Telophase- Is when the cell's nucleas starts to reform in the prexisting cell and the daughter cell just created.
Cytokinisis-Is when the cell's membrane reforms around both the parent cell and the daughter cell and the cells are now no longer dependent on eachother and Mitosis ends.
Then we had a Quiz on that stuff
On monday, we talked about the things that happen mitosis and the stages/phases that occur during Mitosis.
Interphase-the phase that the cell stays in and when the cell copies the DNA/chromosomes for reproducton.
Prophase- Is when the nuclear envelope wears away exposing the sister chromotids.
Metaphase- When the cell's centrioles use the spindle fibers to pull apart the sister chromotids.
Anaphase- Is when the cell's centrioles seperate the sister chromotids and go to the other ends of the dividing cell.
Telophase- Is when the cell's nucleas starts to reform in the prexisting cell and the daughter cell just created.
Cytokinisis-Is when the cell's membrane reforms around both the parent cell and the daughter cell and the cells are now no longer dependent on eachother and Mitosis ends.
Then we had a Quiz on that stuff
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