wat is mitosis????

Answer 1

i am also a school Guy.Last month i read about mitosis & meosis in my syllabus book.but i didnt understand what is that ****?next day my teacher explained that
i tell u that explaination:
There are various structures within the cell, but many are too difficult to see. For example, within the nucleus lie the chromosomes. These are important for heredity and reproduction. When a cell splits and becomes two, certain processes occur within the nucleus first. One of these processes involves the splitting of the chromosomes. This process is called Mitosis and there are four distinct stages.

PHASES OF MITOSIS:

First Phase is called Prophase, the DNA molecules of the chromosomes condense. The outer boundary of the cell is the faint circle just inside the box.

Second Phase is called Metaphase. The chromosomes line up in the center of the cell, separate and become a pair of identical chromosomes

Third Phase is called Anaphase. Each set of chromosomes moves toward the opposite end of the cell.

Fourth Phase is called Telophase. Here, the spindle fibers disappear, the nuclear membrane appears and the cell divides into two daughter cells. Notice the indentation starting on the outer cell wall. Eventually these two indentations will touch and the cell will become two.

in short When a cell divides, first the chromosomes split and become two. Each new one looks exactly like the original old one. Then the chromosomes move away from each other and become two similar nuclei. Finally, the cell splits in two, making two new identical cells, each with an identical nucleus

Answer 2

i just learned about that last year. MITOSIS is the usual method of cell division, characterized typically by the resolving of the chromatin of the nucleus into a threadlike form, which condenses into chromosomes, each of which separates longitudinally into two parts, one part of each chromosome being retained in each of two new cells resulting from the original cell.
there are 4 phases is mitosis which are PHASES OF MITOSIS




First Phase is called Prophase, the DNA molecules of the chromosomes condense. The outer boundary of the cell is the faint circle just inside the box.
Second Phase is called Metaphase. The chromosomes line up in the center of the cell, separate and become a pair of identical chromosomes




Third Phase is called Anaphase. Each set of chromosomes moves toward the opposite end of the cell.
Fourth Phase is called Telophase. Here, the spindle fibers disappear, the nuclear membrane appears and the cell divides into two daughter cells. Notice the indentation starting on the outer cell wall. Eventually these two indentations will touch and the cell will become two.

Answer 3

Mitosis is the reproduction of plant cells via a cell division process.

This process has four phases : Prophase, Metaphase, Anaphase and Telephase.

During the process of mitosis, chromosomes are duplicated and seperated into the new cells by spindle microtubules before the cross wall forms for cell division.

Answer 4

Mitosis is a type of cell division by which the number of chromosomes in the nucleus of the daughter cell remains same as that in the parent cell.so it is also called equalizer division.the process of mitosis consists of the following phases- prophase, metaphase, anaphase and telophase.

Answer 5

Mitosis division the chromosomes are divided and equally distributed from mother cells to the daughter cells.Thus the chromosome number is kept constant in the daughter cells.Hence,this cell division is known as the "equalizing division".This division takes place in four (4) stages namely Prophase,Metaphase,Anaphase and Telophase..

Answer 6

Mitosis is the process of cell division in which the chromosomes are duplicated. It takes place in 4 stages namely Prophase, metaphase, telophase and anaphase

Answer 7

mitosis is a cell duplication inside the plant only

Answer 8

Mitosis is the process by which a cell separates its duplicated genome into two identical halves. It is generally followed immediately by cytokinesis which divides the cytoplasm and cell membrane. This results in two identical daughter cells with a roughly equal distribution of organelles and other cellular components. Mitosis and cytokinesis together is defined as the mitotic (M) phase of the cell cycle, the division of the mother cell into two daughter cells, each the genetic equivalent of the parent cell. Mitosis occurs exclusively in eukaryotic cells. In multicellular organisms, the somatic cells undergo mitosis, while germ cells — cells destined to become sperm in males or ova in females — divide by a related process called meiosis. Prokaryotic cells, which lack a nucleus, divide by a process called binary fission.

The process of mitosis is complex and highly regulated. The sequence of events is divided into phases, corresponding to the completion of one set of activities and the start of the next. These stages are prophase, prometaphase, metaphase, telophase and anaphase. During the process of mitosis the pairs of chromosomes condense and attach to fibers that pull the sister chromatids to opposite sides of the cell. The cell then divides in cytokinesis, to produce two identical daughter cells.

Because cytokinesis usually occurs in conjunction with mitosis, "mitosis" is often used interchangeably with "mitotic phase". However, there are many cells where mitosis and cytokinesis occur separately, forming single cells with multiple nuclei. This occurs most notably among the fungi and slime moulds, but is found in various different groups. Even in animals, cytokinesis and mitosis may occur independently, for instance during certain stages of fruit fly embryonic development.[1] Errors in mitosis can either kill a cell through apoptosis or cause mutations that may lead to cancer.

Overview
The primary result of mitosis is the division of the parent cell's genome into two daughter cells. The genome is composed of a number of chromosomes, complexes of tightly-coiled DNA that contain genetic information vital for proper cell function. Because each resultant daughter cell should be genetically identical to the parent cell, the parent cell must make a copy of each chromosome before mitosis. This occurs during the middle of interphase, the period that precedes the mitotic phase in the cell cycle where preparation for mitosis occurs.[2]

Each chromosome now contains two identical copies of itself, called sister chromatids, attached together in a specialized region of the chromosome known as the centromere. Each sister chromatid is not considered a chromosome in itself, and a chromosome does not always contain two sister chromatids.

In eukaryotes, the nuclear envelope that separates the DNA from the cytoplasm degrades, and its fluid spills out into the cytoplasm. The chromosomes align themselves in a line spanning the cell. Microtubules, essentially miniature strings, splay out from opposite ends of the cell and shorten, pulling apart the sister chromatids of each chromosome.[3] As a matter of convention, each sister chromatid is now considered a chromosome, so they are renamed to sister chromosomes. As the cell elongates, corresponding sister chromosomes are pulled toward opposite ends. A new nuclear envelope forms around the separated sister chromosomes.

As mitosis completes cytokinesis is well underway. In animal cells, the cell pinches inward where the imaginary line used to be, separating the two developing nuclei. In plant cells, the daughter cells will construct a new dividing cell wall between each other. Eventually, the mother cell will be split in half, giving rise to two daughter cells, each with an equivalent and complete copy of the original genome.

Prokaryotic cells undergo a process similar to mitosis called binary fission. However, prokaryotes cannot be properly said to undergo mitosis because they lack a nucleus and only have a single chromosome with no centromere.

You could get more information from the link below...

Answer 9

a common method of cell division: the nucleus is divided resulting in two new nuclei, each of which contains a complete copy of the parental chromosomes.

Answer 10

http://www.infoplease.com/search?fr=iptn&query=mitosis&in=all&x=0&y=0