why must mitotic cells be used to prepare a karyotype?
918391
When cells prepare for mitosis their DNA strands twist together more and shorten enough to be seen under a microscope.  During normal interphase the DNA is unraveled and working, so the strands appear longer and thinner.  Most microscope cannot allow you to see these thin strands.
746150
http://en.wikipedia.org/wiki/Mitosis\nhttp://en.wikipedia.org/wiki/Meiosis\n\nBecause meiosis is a "one-way" process, it cannot be said to engage in a cell cycle as mitosis does. However, the preparatory steps that lead up to meiosis are identical in pattern and name to the interphase of the mitotic cell cycle.
751017
The importance of mitosis is the maintenance of the chromosomal set; each cell formed receives chromosomes that are alike in composition and equal in number to the chromosomes of the parent cell. Transcription is generally believed to cease during mitosis, but epigenetic mechanisms such as bookmarking function during this stage of the cell cycle to ensure that the "memory" of which genes were active prior to entry into mitosis are transmitted to the daughter cells\nMitosis is the process by which a cell separates its duplicated genome into two identical halves. It starts with 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.\nVR
461602
Phases of mitosis\n \nThe cell cycle.The mitotic phase is a relatively short action-packed period of the cell cycle. It alternates with the much longer interphase, where the cell prepares itself for division. Interphase is divided into three phases, G1 (first gap), S (synthesis), and G2 (second gap). During all three phases, the cell grows by producing proteins and cytoplasmic organelles. However, chromosomes are replicated only during the S phase. Thus, a cell grows (G1), continues to grow as it duplicates its chromosomes (S), grows more and prepares for mitosis (G2), and divides (M).\n\nMitosis is a continual and dynamic process. For purposes of description, however, mitosis is conventionally broken down into five subphases: prophase, prometaphase, metaphase, anaphase, and telophase.\n\n[edit]\nProphase\n \nProphase: The two round objects above the nucleus are the centrosomes. Note the condensed chromatin.Main article: Prophase \nNormally, the genetic material in the nucleus is in a loosely bundled coil called chromatin. At the onset of prophase, chromatin condenses together into a highly ordered structure called a chromosome. Since the genetic material has already been duplicated earlier in S phase, the chromosomes have two sister chromatids, bound together at the centromere by the protein cohesin. Chromosomes are visible at high magnification through a light microscope.\n\nJust outside the nucleus are two centrosomes. Each centrosome, which was replicated earlier independent of mitosis, acts as a coordinating center for the cell's microtubules. The two centrosomes sprout microtubules (which may be thought of as cellular ropes or poles) by polymerizing free-floating tubulin protein. By repulsive interaction of these microtubules with each other, the centrosomes push themselves to opposite ends of the cell (although new research has shown that there might be a mechanism inside the centromeres that also grab the microtubules and pull the chromatids apart). The network of microtubules is the beginning of the mitotic spindle.\n\nSome centrosomes contain a pair of centrioles that may help organize microtubule assembly, but they are not essential to formation of the mitotic spindle. Plant cells that lack centrioles have no trouble undergoing mitosis.\n\n[edit]\nPrometaphase\n \nPrometaphase: The nuclear membrane has degraded, and microtubules have invaded the nuclear space. These microtubules can attach to kinetochores or they can interact with opposing microtubules.Main article: Prometaphase \nThe nuclear envelope dissolves and microtubules invade the nuclear space. This is called open mitosis, and it occurs in most multicellular organisms. Some protists, such as algae, undergo a variation called closed mitosis where the microtubules are able to penetrate an intact nuclear envelope.\n\nEach chromosome forms two kinetochores at the centromere, one attached at each chromatid. A kinetochore is a complex protein structure that is analogous to a ring for the microtubule hook; it is the point where microtubules attach themselves to the chromosome. Although the kinetochore is not fully understood, it is known that it contains a molecular motor. When a microtubule connects with the kinetochore, the motor activates, using energy from ATP to "crawl" up the tube toward the originating centrosome. The kinetochore provides the pulling force necessary to later separate the chromosome's two chromatids.\n\nWhen the spindle grows to sufficient length, kinetochore microtubules begin searching for kinetochores to attach to. A number of nonkinetochore microtubules find and interact with corresponding nonkinetochore microtubules from the opposite centrosome to form the mitotic spindle.CXV\n\nPrometaphase is sometimes considered part of prophase.\n\n[edit]\nMetaphase\n \nMetaphase: The chromosomes have aligned at the metaphase plate.Main article: Metaphase \nAs microtubules find and attach to kinetochores in prometaphase, the centro
257262
Interkinesis is the period of time between Meiosis I and Meiosis II. Thus, reductional division has occurred and there should be half as many chromosomes in a single daughter cell nucleus as there were in the mother cell nucleus. \n\nSince the mother cell nucleus had 24 chromosomes, a daughter cell nucleus should now have 12 chromosomes. These 12 chromosomes should be in the replicated state. Thus, there will be sister chromatids -- two per replicated chromosome. Therefore, there should be 24 sister chromatids. \n\nBecause reductional division produced daughter cels with half as many chromosomes, there should also be only half as much DNA in each daughter cell nucleus: 30 ng!
772090
B) Anaphase 1 \nAnaphase I\n\nKinetochore microtubules shorten, severing the recombination nodules and pulling homologous chromosomes apart. Since each chromosome only has one kinetochore, whole chromosomes are pulled toward opposing poles, forming two haploid sets. Each chromosome still contains a pair of sister chromatids. Nonkinetochore microtubules lengthen, pushing the centrioles further apart. The cell elongates in preparation for division down the middle. Also Homologous pairs line up together at the metaphase plate.
275474
Mitosis occurs to repair old cells, to create more cells for growth and development and replace cells on a regular basis\n\nThe cell will  likely lyse (die)
841798
Any mitotic division REQUIRES cytokinesis.  It's the split of the cytoplasm and it starts in telophase, the last part of mitosis.
736225
Mitosis describes the process by which the nucleus of a cell divides to create two new nuclei, each containing an identical copy of DNA\nMeiosis, is the process by which certain sex cells are created. If you're male, your body uses meiosis to create sperm cells; if you're female, it uses meiosis to create egg cells
897332
26\n\nIn meiosis, the chromosome pairs are divided in half so the new cell has 1 of each.  This is because this is used to produce cells for reproduction.\n\nWhen 2 of these cells come together,they create 52 chromosomes again to create a new organism with half of each parents genetic material.
226463
I would assume that by the meaning of the term hypotonic that one would want to enlarge the cell, swell it up, which also would make the chromosomes larger. This would make for better karyotype vewing.
699753
This is a common mistake, when mitosis occurs, DNa has already been duplicated by the cell, in the S stage of the cell cycle. The reason is to give the same amount of genetic information to each  cell, so both cells are clones of the parent cell.
457393
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.
488648
Mitosis is the process of dividing a parent cell to make two daughter cells.\nFirst the Centrioles move to the opposite sides of the cell\nthe nuclear membrane dissolves, and the spindle fibers begin to form.(Prophase)\nSecond the chromosomes line up in the center of the cell.(Metaphase)\nThird the centromere breaks up and the spindle fibers pull apart the chromosomes.(Anaphase)\nFourth the nuclear membranes begin to reform, and the nucleus is formed on each cell.(Telophase)\nFinally the cellular membrane separate and 2 daughter cells are formed.(Cytokinises)
578038
Chromosomes are collections of genes which are coded in DNA molecules. Because after the split each daughter cell should be genetically identical to the parent cell, the cell division starts with the parent cell making a copy of each chromosome. \n\nEach chromosome now contains two identical copies of itself, called sister chromatids.\n\nDuring the dividing process the chromatids are split, and one half ends up in each of the two daughter cells.\n\nErrors in the cell splitting process are rare, but the process may go wrong, especially during the early cellular divisions of an embryon.
916206
Mitosis is a continuous process by which the body grows and dead body cells are replaced, in this type of cell division each "daughter cell " contains  the exact number of chromosomes as the "parent cell" 46 also called the diploid number. The process of mitosis  in sperm is called spermatogenesis  and in the ovum , called oogenesis.\nMeiosis is a different type of cell division where reproductive cells undergo 2 sequential divisions. During meiosis the number of chromosomes is reduced to half, 23 chromosomes also called the haploid number. At the moment of fertilization (when the sperm and ovum unite) the new cell contains 23 chromosomes from the sperm and 23 chromosomes from the ova returning to the diploid number of 46 and both the mothers and fathers traits are inherited by the gamete
148014
Mitosis and meiosis are sometimes called the two "nuclear division" processes