The double-stranded chromosomes move to thecenter of the cell. The centromeres separate.?
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Yes. At Metaphase the chromosomes line up on a central axis, then during Anaphase, they separate
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Before a cell divides (that is, undergoes mitosis or meiosis), the DNA strands in the cell nucleus replicate, so that each chromatin strand is double. Chromatin condenses before cell division and becomes visible as chromosomes; each chromosome has "twin" strands that appear as arms, these identical copies of the DNA molecule are the chromatids, united to each other at the centromere. \nDuring cell division, they will become separated (due to centromere duplication) and each sister chromatid will go to one of the descendant cells, so that the same genetic information from each chromosome is passed on to the descendant cells.
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Cells reproduce by cell division. This is called a-sexual reproduction or binary fission or Mitosis. This type of reproduction only requires one induvidual. The cell divides in order two create two daugter cells that are identical to the original cell. First Interphase, when the cell is making copies of DNA. In Prophase, the nucleolus fades and the chromatins condense into chromosomes. In Metaphase, all the chromosomes are aligned on spindle fibers. In Anaphase, the spindle fibers dissaspear. In Telophase, the daughter chromosomes move to the poles. In Cytokinesis, not truly part of Mitosis, there are now two finallized daughter cells.\n______________________\nHope this helps!!! :) :) \nHere's for more information:  http://www.cellsalive.com/mitosis.htm
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mitosis is the process of nuclear division in which the chromosomes replicate and become equally distributed into two daughter so that they hane the same number and type of chromosomes as present in the parent. it was first observed by Strasburger(1870) in plants and by Boveri & Fleming(1879) in animal cells... its also known as somatic division as it involves only the somatic body cells, also since its keeps the chromosome numeber the same its also known as equitorial division..\n\n\nmeiosis occurs in diploid cells and gives rise to four haploid nuclei, each havin n/2 number of chromosomes, here n is the number of chromosomes.. in this the nuclei divides twice but the chromosomes are replicated only once....\n\nits divided into 2 stages\n1. Meiosis 1\n2. Meiosis 2\n\neach have a number of sub stages..\n\nthere are 1000's of major differences, i'll sorting them, its upto u to remember the one... and as far as the pneumatic device is considered, it's common 2 all of us..\n\n\n1. Mitosis takes place in somatic cells, whereas Meiosis in reproductive cells.\n\n2. mitosis occurs in both haploid & Diplois, meiosis in diploid only.\n\n3. 2 & 4 daughter cells produced resp..\n\n4. CHROMOSOMES REPLICATE IN THE INTERPHASE BEFORE EVERY DIVISON IN MITOSIS BUT IN MEIOSIS THEY REPLICATE ONLY ONCE PRIOR TO MEIOSIS.
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A chromatid forms one part of a chromosome after it has coalesced for the process of mitosis or meiosis. During either process, the word "chromosome" indicates a pair of two exactly identical ("sister") chromatids joined at the central point of each chromatid, called the centromere.\n\nA chromosome, by definition, has exactly one centromere. Thus when sister chromatids are pulled apart by the mitotic spindle during anaphase -- that is, when the centromere joining two sister chromatids splits into two centromeres -- then each sister chromatid becomes an independent chromosome.\n\nIn non-gametic, non-dividing human cells, there are 23 pairs of chromosomes, thus 46 chromatids. When it is ready for mitotic cell division, each chromosome will replicate itself during the synthesis phase within its life cycle, making a total of 92 chromatids before dividing, producing two cells each with 46 (remember, since the term "chromosome" is redefined,but still the number of chromosomes remains 46 despite the replication).\n\nIn gametic cell division (meiosis),the cell replicates once but divides twice so that 23 chromosomes are left in each of four egg or sperm cells. (23 chromosomes are each needed from the male and female to combine and make 46 chromosomes for the zygote.)\n\nA common mistake among students is that they think that chromatids always exist; chromatids ONLY exist when a chromosome replicates itself.
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Mitosis ends with a complete copy of the DNA from the original cell to the new cell.  Meiosis results in a cell with only half of the DNA from the original cell.  The process involves the complete doubling of the DNA from the cell and 2 divisions, so that the cells have only half the chromosomes they need.  This cell is either the egg or the sperm depending on the sex of the animal it is in.  The cell generated from meiosis must combine with another cell from the opposite gender to create a viable embryo.
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They are pulled apart by the mitotic spindle fibers. This happens in anaphase of mitosis. :-)
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In prophase, the cromatids have condensed into chromosomes, sister cromatids joined together at the centrmere (the structure looks like an X).  These chromosomes can be seen with a light microscope as well.  So, if you see X-shaped chromosomes that aren't lined up in any order, the cell is in prophase.\n\nIn metaphase, the chromosomes line up at the equatorial plane of the cell still in the X-shaped chromosome form.  \n\nIn anaphase, the sister chromatids separate at the centromere and start heading towards opposite poles of the cell.  The DNA is in bundled chromatid form.
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Interphase: DNA replication\nProphase: Chromosomes become visible, nuclear membrane and nucleoli disappear, spindle forms between centrosomes\nMetaphase: Chromosomes align at cell equator and spindle fibers attach to kinetochores\nAnaphase: chromatids pulled apart to opposite poles of the cell once centromeres divide\nTelophase: chromatids (chromosomes) reach opposite poles and opposite of prophase occurs\nCytokinesis: the rest of the cell divides
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Centrioles are found only in animal cells. Also, in plants, cell division mainly takes place in special regions called meristems. These rapidly dividing areas will either elongate the tips of the plants' stems and roots or expand their width. In animals, cells divide everywhere. Cytoplasmic division is also different in plant cells. Plants divide the two daughter cells by building new cell walls rather than by cleaving (pinching in two) as animal cells do.
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none\n\n\nyou start with one pair of homologous chromosomes in prophase I of meiosis I.  at metaphase I, these homologues line up across the metaphase plate, and at anaphase, they seperate so that one homologue goes to one pole, and the other homologue goes to the other pole.  after cytokinesis at the end of telophase I, you have one homologue in each cell...that homologue then goes through meiosis II, and at metaphase II, that homologue lines up at the metaphase plate with each sister chromatid facing each pole, and the chromosome is "pulled apart".  Anaphase II pulls the sister chromatids to each pole, and cytokinesis splits the one cell into two....two cells, each containing one sister chromatid of a homologous pair. (although in some text books this is refered to as a single homologue)
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Chromosome Terms before and after DNA Duplication (Replication)\nNote: Duplication and replication mean exactly the same thing.\n• An unduplicated chromosome is one chromosome. A chromosome more or\nless consists of two arms that extend from a narrow "centralized" region called\nthe centromere. The centromere region is often visible when chromosomes\nduplicate.\n• When a chromosome duplicates, it becomes one duplicated chromosome,\nand the two copies remain attached to each other. Note it is still one\nchromosome.\n• The two exact copies of the duplicated chromosome, which remain attached by\nthe protein cohesin, are called "sister" chromatids. They are identical to\neach other. It is essential that you remember this!\n• At the centromere region of the duplicated chromosome, structures (made of\nprotein and DNA) called kinetochores form during division. The three-layered\nkinetochores attach to microtubules of the spindle during mitosis. The\nkinetochores of the two sister chromatids face in opposite directions.\nKinetochore – TEM\n• After the identical sister chromatids are separated during mitosis, each (called\na "daughter" chromosome now) becomes a single unduplicated chromosome\nagain.\nRemember: A chromatid must be attached to its identical chromatid and the two sister\nchromatids comprise one duplicated chromosome. "Sister" chromatids are not two\nchromosomes. They are one duplicated chromosome that consists of two identical\nchromatids. Once sister chromatids are separated they are no longer chromatids!
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meiosis - cell divides but chromosomes are not duplicated. the product is two haploid cells with slightly different DNA (due to crossing over of chromosomes when they line up in metaphase)\nmitosis - cell divides into two identical daughter cells. if the mother cell is diploid, the two daughter cells will be too
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During metaphase in mitosis the chromosomes are aligned at the metaphase plate so that sister chromatids can separate during anaphase. missing this important step will lead to unequal distribution of chromatids between daughter cells which could be fetal to these cells or make them abnormal in terms of chromosome number.
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centrioles are like:\n-2 magnets separating soduim(chromosomal part) and chloride(chromosomal part) from a solution of salt(stuff in nucleus) .
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That is a weird analogy.  Centrioles are part of the centrosome.  The centrosome is the part of the cell that microtubules (protein tubes) are organized from during cell division.  The microtubules attach to the chromosomes as "spindle fibers" or the "spindle apparatus" and are used to help reel half of the chromosomes to each side of the cell.  If the chromosomes  were "the prisioners" then the 2 centrosomes would be the guards that hold the "chains" (microtubules) and pulls each half of the prisoners towards them when the prison splits in half.
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Those organells have their own genome, and it replication is not involved in the chromosome crossing over and other variation mechanisms on cell splitting. During the cell splitting they just stay a few on each side and thats how each new cell has chloroplasts