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Meiosis modeling activity essay

Background Information

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Meiosis is the procedure by which eukaryotic organisms create egg and sperm having half the genetic details (haploid) of the other cells in the organism’s body (diploid). You will observe some commonalities to mitosis but some distinct differences in meiosis that lead to genetic diversity in the gametes as well as the offspring formed by the eventual fusion of the egg and ejaculation.

Two of one of the most noted differences in meiosis will be that 1) there are two complete divisions resulting in 4 daughter cells and, 2) meiosis has crossing more than, an even that develops in Prophase I that increases hereditary variation inside the gametes.

Crossing over occurs between homologous chromosomes. These are the pairs of chromosomes in an organisms body that carry family genes for the same attribute located by identical positions on the two chromosomes. Even though they take the same gene they may, however , possess different alleles intended for the gene which bring about different kinds of the attribute.

Pre-Lab:

1 . Bring a tetrad in the space below and label the following: centromeres, sis chromatids, homologous chromosomes.

installment payments on your What are the 2 elements of meiosis that add variation to our population? (Hint: one takes place in prophase I plus the other in metaphase I).

3. Which in turn of the chromosomes #2-5 could be homologous with chromosome #1? Explain the answer. I believe number your five because it is the same as 1 .

Lab:

1 . 1st view the saving on my message board under “Supplemental Learning Materials” for this lab. You will need the “code words” from the saving for one of the conclusion inquiries. Link to saving:

http://www.connectionslivelesson.com/p2fwrdno8yk/ 2 . When you have viewed it, gather the required components. You will need some forks, 4 knives, four spoons, six rubber bands, and several twine or string to use as cell membrane. If you can have two different types of flatware that could be best (for example: two forks, 2 knives, and 2 spoons that are different than the additional set of 2 forks, 2 kitchen knives, and two spoons). 3. Your unit cell consists of 6 chromosomes (3 homologous pairs). Utilize string to create the cellular membrane to your cell(s). Start out with two forks, two kitchen knives, and two spoons (one of each via each set) inside your thread cell membrane as demonstrated in the recording. Proceed through each one of the steps of meiosis using your flatware “chromosomes. ” Utilize the textbook pages 324-325 intended for help. Stage

Modeling

Interphase

Replicate the DNA of the chromosomes by adding a second hand, knife, or spoon to each existing fork, knife, and spoon. Carry each set of “chromatids” together with a rubber band (centromere). Prophase My spouse and i

Create tetrads (XX) by simply pairing homologous chromosomes (set them up coming to each other). Model bridging over as best you can offered the unit we are employing. Metaphase We

Get in line your tetrads along the metaphase plate. Unit independent assortment. Anaphase We

Approach the homologous chromosomes to opposite ends of the cell. Telophase My spouse and i

You ought to have three chromosomes, knife, shell, and spoon, (each consists of two chromatids) in every of your two nuclei. Cytokinesis I

Divide the cell membrane so that you include two child cells (two string groups for cells). Prophase 2

Check to make sure that every single of your two cells consists of three chromosomes made up of sis chromatids. Metaphase II

Line the chromosomes up along the central of each of the cells. Anaphase II

Separate the sister chromatids (remove plastic band holding them together). Move one particular sister chromatid from every single chromosome to opposite edges of your cellular. Telophase 2

You should now have four nuclei, with three one chromosomes in each of the cells. Cytokinesis II

Divide your cell walls so that you have four little girl cells (use more string).

Data:

Take several photos or create several drawings of the model mainly because it looked in 3 diverse stages of meiosis as described inside the table above. Indicate which will stage of meiosis is definitely shown in each photo/drawing. Include the photos or a check of the paintings when you publish your research laboratory to the drop box.

Conclusion (6 points)

1 . List both code terms that were given in the lab recording found on my own message board.

Chromosomes and fertilization??

2 . Truly does mitosis even more closely look like meiosis I actually or meiosis II? Describe your answer.

More like Meiosis I since it only made two cells.

3. Precisely what is crossing over? When does it occur during meiosis? Why did you have difficulty building this component of meiosis employing your “chromosomes? “

Crossing over is the process in which homologous chromosomes exchange portions of their chromatids during meiosis. This occurs during prophase My spouse and i. I had a difficult time because weight loss really replace the chromosomes so that it was hard to show.

some. Think about your modeling. Aesthetically, what is the main difference between separation of chromosomes between anaphase We and anaphase II

There have been four to split up then only two.

a few. What is impartial assortment? When ever does it arise during meiosis? How

did you model this element of meiosis?

6. Which usually part of meiosis, meiosis I actually or meiosis II, is responsible for reducing the chromosome amount by half in the cell? MEIOSIS II

you

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