can you please explain Meiosis and Mitosis, and what the difference between them is.?

Question

please be very clear and it doesnt have to be long. thanks

Answer 1

The purpose of both mitosis and meiosis is to take one cell and make two cells. Before the cells do this though, they have to make sure that a few things are in order. Obviously, there has to be enough stuff for the 2 cells to each be able to live independently. so, there has to be duplication of a lot of stuff before the first cell (let's call it the parent) divides. One of these things is the genome. These are the chromosomes which are made up of DNA. Once the DNA replicates (makes 2 copies of everything from what the parent originally had), the cell can divide. There are now 4 chromosomes of each type, we started out with our usual 2 of each (most organisms have 2 of each chromosome and they differ slightly from each other-this becomes important for meiosis), then when everything duplicated, we got 4!

In MITOSIS, the 2 cells that come out of the division (lets call them the daughters), are EXACTLY the same in genetic makeup as the original mother cell. They have the very same DNA and therefore make the same proteins and therefore the cells behave the same.

In MEIOSIS on the other hand, the cells are not the same at all. And in fact, this is the point of meiosis - to make new types of cells. You may know that eggs and sperm are products of meiosis, but you not only get a mixing of genes from your mother (from the egg) and father (from the sperm), but the genes inside the egg and sperm are pre-mixed because of meiosis. Thus, genetic diversity!, and an explanation for why you have traits given to you from your grandmother through your father, even though your father may not have that trait (he carries it in his genes for later mixing). This may be a complicated issue in itself but since we have 2 of every chromosome and therefore 2 of every gene (even before the DNA replication that preceeds mitosis), there's a chance that the 2 copies of the same gene are different, one of which shows up in your father and one which you have that you got from your grandmother throuh your father. The mixing, by the way comes about because after the DNA replicates in preparation for cell division. This is neat and involves chromosomes breaking apart and joining back together. Take a look at the animated movie of meiosis at http://www.biology.yale.edu/animatedMeiosis.nclk - make a point to notice the red and green chromosomes at the beginning and the mixed ones at the end.

Answer 2

As you know, most cells have two pairs of chomosomes. One from mom and one from dad. In mitosis, these divide and make two just like the first.

Meiosis is how eggs and sperm are made. During meiosis, the chromosomes are reduced by half so that only one pair is in each egg and sperm. That way, when an egg and sperm get together, the new cell has the right number again.

Ain't nature wonderful B-)

Answer 3

Mitosis - 1 parent cell
Meiosis - require two parent cells, sex gonads, male and female

Mitosis - 2 daughter cells
Meiosis - 4 daughter cells

Mitosis - genetically identical daughter cells
Meiosis - non-genetically identical daughter cells

stages:
Mitosis - Prophase, Metaphase, Anaphase, Telophase
Meiosis - has Meiosis I and Meiosis II
Meiosis I - has Prophase I, Metaphase I, A..I, T...I
Meiosis II - has Prophase II, Metaphase II, A..II, T..II

Mitosis - no DNA synthesis
Meiosis - DNA synthesis

Answer 4

Meiosis is where there is more than one division of cells. Results in 4 daughter cells. Mitosis is only one division of cells and results in only 2 daughter cells

Answer 5

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Answer 6

There are two types of cellular division:
1-Mitosis: it occurs in all body cells except reproductive and neural cells.The original cells divides mitotically giving two identical cells with the same number of chromosomes of the original cell.
Importance:
-growth of multicellular organisms
-compensates damaged cells or tissues
-produces individuals which are identical to their parents
-accomplishes asexual reproduction
2-Meiosis:it occurs in male and female gonads to produce male and female gametes[sperms and ova].The original cell divides meiotically giving four cells which contain half the number of chromosomes of the original cell.
Importance:
produces male and female gametes so it accomplishes sexual reproduction.

Answer 7

meiosis only occurs in the sex cells.
mitosis occurs in all the others.
hang on....it might be the other way around.

Answer 8

http://answers.yahoo.com/search/search_result;_ylt=AmreU3VsYvKV.inyAo1XALUezKIX?p=Meiosis+and+Mitosis

go to this link it will list all the questions asked in yahoo answers on this particular topic and I'm sure by browsing thru the answers given you will find what you are looking for.

Answer 9

I see someone's having a little trouble getting the homework done today.

Sorry, but I'm not going to make it that easy for you. A little Internet research, though, and you can find it all out for yourself.