Science

This week in science, we learnt how to make a punnet square and what a Homozygous or a Hetrozygues is.
A homozygues is a species that has the same trate from the mom's side and the Dad's side.
A hetrozggues is a species that has two different trates. One from the Dad's side and one on the mom's side.
The recessive trait is always the trait that does not take over unless there are two rrecessive traits, which makes it a homozygues.
If hter is a dominent gene and a recessive gene, the dominent gene always takes over.
This is a great video that i found that helped me understand Genetics.

PS: Read fast
http://www.youtube.com/watch?v=89Grsrsd_jE

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.

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.

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

Science

This week in science we did a lot of things. We had a unit test on how celluar respiration and on the things before that.
On Tuesday, we reviewed for the teas on Tuesday by watching a video on how our skin and body is crawling with living organisms. On Wednesday, we had the test on The things we learnt on cells before.
On Thursday we looked at cells under the microscope to learn about mitosis, which is when cells reproduce.
On Friday, we went to a website that shows the different stager of mitosis and did a workshhet on it. Here is the website: http://www.cellsalive.com/mitosis.htm.

Science This Week

This week in science, we studied how a cell reproduces a cell. The process is called mitosis. The cell first starts as a cell with a nucleas, (a regular cell), Then it gets a fuzzy circle around the nucleas.Next there is a giant nucleas. And finally, the cell divides into another cell and another cell gets created. The exact DNA of the prexisting cell was copied and then put into the new cell.

This is a website that shows an animation of this:http://www.cellsalive.com/mitosis.htm.
We also learnt how mRNA gets translated by the ribosome. This is a good show to go to that will explain how transcription and translation takes place:http://www.youtube.com/watch?v=nl8pSlonmA0

During the week in science, we did a lot of things.Here is what we did;




We learnt how to decifer DNA and RNA reading. this is an image of RNA being translated by a ribosome.











Below is a website that explains mRNA translation.
http://www.biology.iupui.edu/biocourses/N100/2k3ch13dogma.html



When a cell needs to make new proteins, it sends out a part of its DNA called RNA. That Messenger RNA goes to the ribosome that is on the outside of the nucleas and gets read by it. The ribosome then creates the proteins that the mRNA told it to make. Those proteins then go to the golgi apparatus to get sent to the part of the cell that needs
it.

We also learnt why a fish cannot survive out of water.This is how: When a fish is in the water, the fish's gills filter out the water and other chemicals in the water. Then it only allows the oxygen to get into the fish so the fish could breathe.
If the fish was out of the water, the fish would not be able to breathe because the gills of the fish cannot filter the other gasses in the air and only let the oxygen in. Therefore the wish will suffocate to death.