what is metaphase?

Answer 1

Metaphase, from the ancient Greek μετα (after) and φασις (stage), is a stage of mitosis in the eukaryotic cell cycle in which condensed chromosomes, carrying genetic information, align in the middle of the cell before being separated into each of the two daughter cells
Preceded by events in prometaphase and followed by anaphase, microtubules, formed in prophase have already found and attached themselves to kinetochores in metaphase. The centromeres of the chromosomes convene themselves on the metaphase plate, an imaginary line that is equidistant from the two centrosome poles. This even alignment is due to the counterbalance of the pulling powers generated by the opposing kinetochores, analogous to a tug of war between equally strong people. In certain types of cells, chromosomes do not line up at the metaphase plate and instead move back and forth between the poles randomly, only roughly lining up along the midline.
Early events of metaphase can coincide with the later events of prometaphase, as chromosomes with connected kinetochores will start the events of metaphase individually before other chromosomes with unconnected kinetochores that are still lingering in the events of prometaphase.
One of the cell cycle checkpoints occurs during prometaphase and metaphase. Only after all chromosomes have become aligned at the metaphase plate, when every kinetochore is properly attached to a bundle of microtubules, does the cell enter anaphase. It is thought that unattached or improperly attached kinetochores generate a signal to prevent premature progression to anaphase, even if most of the kinetochores have been attached and most of the chromosomes have been aligned. Such a signal creates the mitotic spindle checkpoint. This would be accomplished by regulation of the Anaphase Promoting Complex, securin, and separase.

of coarse u must know more abt. mitosis in ordert to understand what metaphase is:

Mitosis is really a division of the nucleus into two identical nuclei. It is followed by cytokinesis which is the division of the cytoplasm into two.

Just imagine for a moment. You started your life as a single cell == a fertilized egg or zygote. THIS WAS THE FIRST YOU. By mitosis, you divided into two cells, both of your cells divided again (4) and again (8) and again(16) and again (32) and again ..... really boring but this is what you did. Now you consist of billions of cells (all genetically identical to each other). Mitosis is essential for growth and repair.

During mitosis, one cell divides into two genetically identical cells. Before mitosis starts you cannot see any chromosomes in the nucleus, however, all the DNA in the nucleus is replicated exactly. This stage is not a part of mitosis: it is called interphase (between divisions).

Prophase:
During prophase the chromosomes coil up. They become shorter and fatter. The nuclear envelope seems to disappear. If you squash the cell and look at it under a microscope it is possible to see chromosomes and count them. You would see 46 chromosomes in a normal human cell. This stage may take over one hour.

metaphase:
This is a very short stage in mitosis. The chromosomes move and line themselves up at the equator of the cell. It should be possible with a good microscope to see that each chromosome has divided into two daughter chromatids. These are genetically identical to each other. This stage only takes about 15 minutes.

anaphase:
During anaphase the chromatids separate (are pulled apart) and move to the poles (opposite ends of the cell). You may be able to see spindle fibres which help to pull the chromatids apart. Although this stage only takes about ten minutes, it is the most interesting stage because it shows that the cell division is genetically exact.

telophase:
Now there are 46 daughter chromatids at each end of the cell. Each one uncoils: it gets longer and thinner. It is no longer possible to see and count individual chromosomes. This stage takes much longer but it is not so interesting.

After mitosis has taken place (the division of the nucleus) the cell divides into two cells. This process is called cytokinesis. New cell membrane is formed dividing the cell into two.

I am made of billions of cells, they are all genetically identical to each other and identical to my original self 54 years ago when I was a fertilized egg or zygote.

Answer 2

What Is Metaphase In Mitosis

Answer 3

When cells divide, it is a continuous process without clearly defined steps. When you bake a cake - the ingredients are gathered up, mixed, poured, and baked. The first 3 steps are clearly defined, but what about the last step. At what point does the cake change from goo to devilsfood? It phases from one state to the other.
Metaphase is a step along the way in cell division and is characterized by the alignment of chromosomes.
During prometaphase, the microtubules start to connect and the nuclear membrane disolves.
In Metaphase, the centromeres of the chromosomes line up.
In anaphase, the chromosomes split and move apart.

Answer 4

What Is Metaphase

Answer 5

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I'm assuming you mean in meiosis..... first of all in metaphase 1 there are twice the number of chromosomes than in metaphase 2.

Answer 6

Metaphase is one of the stages of cell division. During this phase all of the condensed chromosomes line up on the metaphase plate.

Answer 7

Metaphase is a time period in cell division after prophase and before anaphase which is an observable phase under the microscope. It is the time where the chromosomes allign. Spindle microtubules are attached to centromeres of chromosomes.

Answer 8

metaphase in the mitosis is when all the duplicated chromosomes arrange themselves in the equator of a cell called metaphase plate with their centromeres stuck to the spindle fibres which are radiated by pairs of centrioles.....the chromatids are not seperated yet in metaphase...

Answer 9

metaphase is a stage under mitosis.. it is where chromosomes align themselves in the equatorial plate,

Answer 10

metaphase is a stage of mitosis. it is the second stage.