Presentations

file://mitosis1/Today in class we started trying something new.
Everyone brought their phones to class,and each group was given a dry erase board,peices of postists, and we are making slide shows of examples of mitosis.
*We also as always have our group leaders.*
The post its were in an order to help us. The cell we are making, is a fruitfly, and each color postit (purple, blue,pink, and yellow) represent chromosomes. The presentation must be from interphase to cytokinesis. First, my group drew a cell, and labled it interphase. We aranged the postits in the nucleus, so the nucleus was very visible. We took a picture with my phone and emailed it to our selfs so we could put it our presentation. We did Prophase, reranged the postits,and took another picture. We repeated the steps, for each stage. While some people are drawing and making the cells, others are making our presentation.

Remember your group leaders, checking for homework, checking the blog calendar, and comenting once a month! (or more)
:)
Natalie (4th)

Mitosis Review

Today in class we went over our answers for the book questions which we did over the past two days. We also confrenced our answers for the extended responce (questions 7 and 8).

For the multiple choice the answers were:

1. D ten hours

2. C 21 hours

3. D 22 hours

4. A DNA replication

5. B 6 hours

6. B metaphase.

We dont go over the answers with Mr. Finley so make sure you contact your group to find out the answer they got!!! Make sure that you use your time vey thoroughly because you never know weather or not you will be handing the work in!!!

The stages of mitosis in order are:

1. Prophase

2. Metaphase

3. Anaphase

4.Telephase

Next we went over what happens in prophase which is the process of chromatin (unraveled chromasomes) becoming chromasomes. Only one other important thing happens, which is the centrasomes become centreals and then they move to opposite sides of the cell. plus only chromatin is visible in the microscope!! So basically, the chromatin becomes chromasomes. Then the nuclear membrane breaks down. And Finally, the centreals go to opposite sides of the cell.

Next we went over Metaphase. The big idea is that the nucleus totally dissapeared and dissolved. And that the centreals have produced spindle fibers connecting to the chromasomes (the centromere to be exact). And there is one last thins that is MOST IMPORTANT THING IN METAPHASE IS: that all the spindle fibes aline the chromasomes to the CENTER on the cell.

After we went over anaphase. So prepair youself, this might be tricky. First thespindle fiber pull apart all the chromasomes to opposte sides of the cell. You can tell the cell is in anaphase by the chromasomes pointing to the center of the cell.

And finally, telephase. A new neculus forms around the chromasomes and the cell begins to pinch apart.

*REMEMBER YOUR GROP LEADERS AND TO COMMENT ON YOUR BLOGS!!!

-V.F. (tori fusco)

Splitting Up Into Groups

Mr. Finley is splitting us into different groups.

Group 1: Complete pg. 97

Group 2: At the front reviewing worksheet and look at cells.

Group 3: Completing simulation and taking notes. - 1. go to cellsalive.com 2. click on mitosis 3. write important steps for each stage write key terms

I am in group 1 right now...

1) How long does the growth phase of the cell cycle take?

2)How much time does the cell cycle spend in Interphase?

3)What total length of time it takes for the skin cell to complete 1 full cell cycle?

4) What phase of the cell cycle takes about 8 hours?

5)Suppose another type of skin cell takes 44 hours to complete one cell cycle. If all of the phases are proportional to the length of time shown in the diagram, how long will the preperation for the cell division phase last?

6) According to the diagram, what is the 2nd stage of mitosis?

Answer Key:

1) D- 10 hours

2) C- 21 hours

3) D- 22 hours

4) A- DNA Replication

5) B- 6 hours

6) B- Metaphase

7) We can account for these numbers because the cell spends the most time in interphase. So more cells will be in inter[hase. Then since it takes less time for mitosis to happen less cells will be in mitosis.

8) You could use an onion root and put it in different temperatures.

Now I am in group 2...

1) Why would we expect the onion root to be dividing?

We said the onion root would be dividing because it needs to grow so it can gather more water for the plant.

2)What are the dyed objects inside the cell?

Chromosomes.

3) Is there evidence of cellular division?

Yes because you see that the chromosomes are in different phases and in different places and that means that they are going through the different cycles and in the different phases they look different.

We didn't finish all of it so the other info on the other group will be posted tomorrow...

R.K. (4th time)

Monday, March 7, 2011

Interphase Prophase Metaphase Anaphase

Remember to know your group leader!

Today we went straight to the lab. The lab was looking at a onion root under the microscope and answering some questions. In this lab, the point is to look at the chromosome arangements and trying to see the different stages of cell divisio0n. Here are the questions and their answers:

1. You are looking at the cross sectional of the tip of an onion root. Why might you expect an onion root tip have cells that are dividing?

The cells might divide so that the root can dig deeper and hold the onion in the ground. So really it is for growth.

2.Find and look at all three of the slices breifly. What are the dyed objects inside of the cell?

The dyed objects in the cell are the nuclei.

3. Is there evidence of cellular division? Explain.

Yes, some nuclei are darker than the others because the cell is going through mitosis. They are darker because the chromosomes are beginning, and are, visible.

4. Draw at least 4 different cells at what you'd call "different stages." Only draw ONE cell in each box and label the stage.

See Above

5. Explain why you believe the cell is in each stage.

Interphase: We think this one is in interphase because the necleus cannot be seen and during the interphase the nucleus cannot be seen.

Pro phase: We think this one is in prophase because the chromosomes can be seen.

Metaphase: We think this one is in metaphase because the chromosomes are lined up the middle.

Anaphase: We think this one is in Anaphase because the Dna is on either side fo the cell.

There's the lab! If you didn't finish it in class, yopu have to finish it for homework.

Mark V. 4th time

Period 4 Microscopes Friday, March 4

Do you know who your group leader is?
Mr. Finley started something new and now each group MUST have a group leader!!!

We went over the questions we did on Tuesday.

Question answers
3.1

1. Cell division is important becasue it helps multi-cellular orgainisms to grow develop and repair. Single-celled organisms use cell division to reproduce.
2. Genetic material in cells is orgainized and contained in the DNA in the nucleus. It contains the cells information for the organisms growth and functions.
3. Cell division is involved in growth, development ,and repair of an organism. In growth the cells grow until they no longer can and split off to create new cells. In develompment the cells develop special characteristics from the cell it split from. When cells repair they replace the old ones with the new ones.
4. DNA compacts before eukaryotic cells divide. The chromosones get compacted around a spool. The chromosones compact more and more and once they've compacted a lot they can be visible under a microscope.
5. Injuries to the skin heal faster because the skin cells heal faster than the cells in your brain.
6. MR. FINLEY DIDN'T GO OVER!!
   

3.2

1. The two main parts of the cell cycle are interphase and mitosis.
2. The cell is growing for mitosis preperation.
3. The genetic material in 2 daughter cells is similar to the genetic material in 2 parent cells because the the daughter cell broke from the parent cells causing them to both have the same genetic materials and characteristics. Ex. Mother and father dog compared to their litter of puppies.
4. First, prophase. Second, metaphase. Third, anaphase. And fourth, telophase.
5. Animal Both Plant
   *Membrane pinches *Divide *Wall splits
6. MR.FINLEY DIDN'T GO OVER THIS ONE!!
   

We then used the microscopes. We looked at the tip of an onion root. Here is an example of what we saw:

Mr. Finley then gave us a sheet to do about what we saw. Here are the questions asked on the sheet.

1. You are looking at cross-sectional slices of the tip of an onion root. Why might you expect an onion root tip have cells that are dividing?
2. Find and look at all three of the slices briefly. What are the dyded objects inside the cell?
3. Is there evidence of cellular division? Explain.
4. Draw at least 4 different cells at what you will call "different stages". Only draw ONE cell in each box and label the stage.
5. Explain why you believe the cell is in each stage.

The bell rang while we were still working but Mr. Finley said we didn't have to finish it. You could if you want to.

E.M. 4th time around

March 3,2011

Today we began class by answering the following questions. (I included my goup and classes responses)
Example of a Eukaryotic One Celled Organism-1) paramecuim
2) euglena
Example of Multi Celled-
1) Sunflower
2) Sara
3) Dog
* be specific about your examples

Which of the examples above would use mitoses to grow/develop/repair/cells? Why?
Only multi cellular organisms use mitoses because if a single celled organism splits and creates more then it isn't a single celled organism anymore because SINGLE celled means only one cell. Mitoses is the process of the nucleus divideing. If we destroy every cell in our body then we can't survive becuase we are designed to have multi cells and single celled organisms are metn to have 1 cell. A dog will use mitoses to grow and repair itself if it gets hurt. Also, humans will repair themselves if they get cut. They use it to grow too. ex. newborn--> toddler--> child--> tween--> teenager--> adult-->senior
How would the other use mitoses?
The single cell organism would use it to reproduce.
What would be true about the two resulting cells?
They all are exactly the same. If we looked at multiple cheek cells they would look the same.

Extra notes
*differeent types of cells look different becuase they are designed to do different things
4 stages of mitoses
1) prophase
2)metaphase
3)anaphase
4)telophase
3 big parts of the cell cycle
1) interphase (longest stage)
2) mitoses
3) cytokenisis (shortest stage)
cytokenisis is the actually process of splitting
chromosome is coiled up DNA(if it was uncoiled it would be called cromotin)
****************CHROMATID- EACH OF THE SIDES OF A CROMOSOME***********
-SARA M 4th round blog

A chromosome in its "x" form.

March 2, 2011, Period 4 Blog

First off, Mr. Finley gave us credit for the work we did while he was absent. Then, we had a chance to ask some questions. Below is the information gathered from the question and answer session:

Cell Division

- Chromosomes are formed by two DNA strands going directly next to each other forming an "x" shape. At the center of the "x" is a dot which is called the centronene or the kineticore.

- Microtubleores- strands that pull off a DNA strand from the chromosome.

- Spindlefiber- same as microtubleores

- Chromotin- Unraveled DNA

- DNA is raveled up within the chromosome.

- Mitosis is the process in which the cells divide and the DNA is transferred to the two new daughter cells.(Prophase to Telopahse)We go through mitosis for development and repair.

- Cytokinesis- The cell memberane opens and the cells are two different cells now. (the ripping apart of the two new daughter cells)


By Tim Sienko (4th round)