during mitosis is recombination occurs?
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Spontaneous reciprocal mitotic recombination in the yeast Saccharomyces cerevisiae, associated with heteroallelic recombination, occurs almost exclusively at the two-strand stage and involves recombination of unduplicated chromosomes (i.e., during G1) or the unduplicated regions of chromosomes during the S phase of mitosis. The associated heteroallelic recombination frequently reflects the formation of symmetric Holliday structures, is not strongly polarized with respect to conversion at the heteroallelic trp5 sites studied, occasionally results in simultaneous conversion of widely separated genetic markers, and is positively correlated with recombination of flanking markers.\n\n\nHomologous recombination occurs in all organisms. In eucaryotes, homolgous recombination occurs at a much higher frequency during meiosis than during mitosis.\n\n\nRecombination frequency \nSpecial pairing mechanisms participating only in meiosis contribute to the difference in recombination frequency between meiosis and mitosis. \nOther factors may also contribute. For example, spo11 mutants of S. cerevisiae have defects in meiotic recombination, but not in mitotic recombination or chromosome pairing. \nMany argue that meiotic recombination must serve a purpose. Some point out that recombination speeds evolution. Yet, recombination is not inherently required for evolution. \nBivalent separation \nSeparation of bivalents is unique to meiosis. Some aspect of this process may account for the higher frequency of recombination than in mitosis. \nChiasmata are necessary for stability of bivalent association with the spindle. This stability is necessary for proper segregation at meiosis I. \nChiasmata per chromosome \nChiasmata are necessary for proper chromosome disjunction in meiosis I. \nThere are at least two ways that the presence of at least one chiasma on each chromosome pair can be achieved (ref). \nIn organisms without synaptonemal complexes, the average number of chiasmata per chromosome is so large that chromosomes without a chiasma occur only rarely. \nThe number of chiasmata could be regulated. A synaptonemal complex may inhibit development of multiple chiasmata, thus ensuring the presence of a single chiasma. Genetically, the inhibition is reflected as cross-over interference
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Mitosis is when a cell divides into to identical daughter cells. They contain the same genome as the parent cell. The only way a daughter cell can be altered is through a mutation of DNA/RNA.
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OF COURSE!!!! This is the whole idea of mitosis, my dear!\nAt least in healthy non-cancerous cells.\nEukaryotic cells need to undergo replication of DNA (during the S-phase of the cell cycle) prior to divide into 2 IDENTICAL daughter cells, with identical set of chromosomes containing one copy of each sister chromatide. Mitotic defects are due to problems with the mitotic spindle and generally lead to aneuploidy and to mitotic catastrophe (or cell death). A mechanism of control of this process is called mitotic spindle checkpoint and ensures that the protein complex that keeps the sister chromatides together is only degraded when all the chromosomes are correctly aligned and their kinetochores are attached to the spindle pole bodies. Proteins involved in the regulation of the mitotic spindle checkpoints include kinases, such as BubR1 and AuroraB, proteases, such as separase and the APC complex, and ATPases (clamp loaders) which "load" the complexes onto the DNA.\nOf course, if the cells undergo mutations during DNA replication, the two daughter cells may not be identical, but these are rare events.
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mitosis is the normal mode of cell multiplication and increasing there number without a change in their constiution so it occurs in all the SOMATIC CELLS (normal cells of body not involved in sexual reproduction).\nmeiosis occur in gamete forming cells as it is the reductoinal division
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Firstly you should ask the proper ques. The ques. should be like this "What is the difference b/w meosis and mitosis".\n        The answer to your ques. is:-\n       MITOSIS                                       MEOSIS\n* Takes place in somatic                  * Takes place in reproductive\n   cells                                                   cells                                    \n* Produces two cells                         * Produces four haploid cells\n* No crossing over                             * Crossing Over takes place\n*The no. of chromosomes re-           * The no. of chromosomes \n  mains the same after mitosis             is reduced to one-half after\n                                                              meiosis
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Meiosis is the process that transforms one diploid cell into four haploid cells in eukaryotes in order to redistribute the diploid's cell's genome.\n\nMeiosis forms the basis of sexual reproduction and can only occur in eukaryotes. In meiosis, the diploid cell's genome, which is composed of ordered structures of coiled DNA called chromosomes, is replicated once and separated twice, producing four haploid cells each containing half of the original cell's chromosomes. These resultant haploid cells will fertilize with other haploid cells of the opposite gender to form a diploid cell again. The cyclical process of separation by meiosis and genetic recombination through fertilization is called the life cycle. The result is that the offspring produced during germination after meiosis will have a slightly different blueprint which has instructions for the cells to work, contained in the DNA. This allows sexual reproduction to occur.\n\nMeiosis uses many biochemical processes that are similar to those used in mitosis in order to distribute chromosomes among the resulting cells; however the outcome is very different.
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#1)  Primarily by mutation.  A mutation must occur a germ cell (cells that produce sperm and eggs).  This can produce progeny with novel traits.  This is fairly rare event (one out of every billion nucleotides copied during meiosis).  Our body has ways of fixing these errors, but this is the biological basis of evolution.\n#2)  By crossing over.  During meiosis, parental chromosomes will swap pieces with each other.  For example, I used pieces of my mother's chromosome #1 and my father's chromosome #1 when I made the chromosome #1 that I passed to my daughter.  I passed a different combination of pieces to construct a chromosome #1 for my second daughter.\n#3)  By independent assortment during meiosis.  So not only did I make novel chromosomes out of pieces of my parents chromosomes, but I created a gamete using a unique combination of my mother and father's chromosomes.  For example I might have used chromosomes 1-11 of my father's (with pieces of my mother's chromosomes 1-11) and numbers 12-22 of my mother's (with pieces of my father's chromosomes 12-22).  For my second daughter it could have been totally different.  It is a unique situation each time!  No two gametes are the same.
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Meiosis Tutorial \nDNA replication precedes the start of meiosis I. During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation allows these to be viewed in the microscope. Note that the bivalent has two chromosomes and four chromatids, with one chromosome coming from each parent. The nuclear membrane disappears. One kinetochore forms per chromosome rather than one per chromatid, and the chromosomes attached to spindle fibers begin to move. Bivalents, each composed of two chromosomes (four chromatids) align at the metaphase plate. The orientation is random, with either parental homologue on a side. This means that there is a 50-50 chance for the daughter cells to get either the mother's or father's homologue for each chromosome.Chiasmata separate. Chromosomes, each with two chromatids, move to separate poles. Each of the daughter cells is now haploid (23 chromosomes), but each chromosome has two chromatids. Meiosis Tutorial \nA review of Meiosis \nComparing Meiosis and Mitosis\nChromosome behavior \nMitosis: Homologous chromosomes independent \nMeiosis: Homologous chromosomes pair forming bivalents until anaphase I \nChromosome number- reduction in meiosis \nmitosis- identical daughter cells \nmeiosis- daughter cells haploid \nGenetic identity of progeny: \nMitosis: identical daughter cells \nMeiosis: daughter cells have new assortment of parental chromosomes \nMeiosis: chromatids not identical, crossing ove \nMeiotic errors\nNondisjunction- homologues don't separate in meiosis 1 \nresults in aneuploidy \nusually embryo lethal \nTrisomy 21, exception leading to Downs syndrome \nSex chromosomes \nTurner syndrome: monosomy X \nKlinefelter syndroms: XXY \nTranslocation and deletion: transfer of a piece of one chromosome to another or loss of fragment of a chromosome. \n\nMitosis, Meiosis, and Ploidy\nMitosis can proceed independent of ploidy of cell, homologous chromosomes behave independently \nMeiosis can only proceed if the nucleus contains an even number of chromosomes (diploid, tetraploid). \nTrisomy 21 does not prevent meiosis
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normal cell has 23 pairs of chromosomes (46 chromatids)\nbefore mitotic division the number doubles to 46 pairs (92 chromatids) the chromosomes are arranged as sister chromatids joined by the centromere and aligned with their copies (this is where recombination events can take place). the pairs are then pulled apart and separated in to the two new cells (each with 23 pairs). \n\nNote: for meiotic division (production of gametes (sperm and egg)) 23 pairs of chromosomes are divided in to 2 lots of 23 single chromosomes.
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During *mitosis*, the cytoplasm of a cell and its organelles separate into two new *identical cells*?\n\nI'm not sure what else you're looking for here...
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Fertilization.\nOr are you asking about what happens in Prophase 1 of Meiosis? Homologous chromosomes, one from each parent pair.
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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.
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From Wikipedia, the free encyclopedia:\nMitosis divides genetic information during cell division. A cell in early anaphaseMitosis 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.
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During s-phase of interphase, the genetic material is duplicated.    So #1 is FALSE.\n\nTelophase sees the production of the nulear membrane.  So in effect, new nuclei are formed, making #2 TRUE.\n\nMitosis creates two daughter cells that are diploid, because it is reproduction of somatic (body cells), no production of gametes (which would be haploid).  So, #3 is TRUE\n\nChromosome find their homolougous pair during prophase of Meiosis, NOT mitosis.  Pairing occurs during meiosis so the the gametes that are haploid can be formed. So #4 is TRUE\n\nEach species has a specific number of chromosomes- fruit flies for example have 8 chromosomes, while humans have 46.  So #5 is TRUE.
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It's cytokinesis.The prophase 1 of meiosis is followed by Meiosis two which is similar to mitosis.Cytokinesis is the formation of plate between the 2 daughter cells.This does not take place in prophase of any type of cell division i.e. mitosis  or meiosis.The other phenomenon is formation of bipolar spindle.This takes place in the start of metaphase.
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See the following link for an animation and explanation of Mitosis. Hope that helps. \n\nIn most cases mitosis occurs by the parent cell diving into daughter cells (usually 2).\n\nhttp://www.cellsalive.com/mitosis.htm
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mitosis is not the 2nd part of meiosis. \ncrossing over does not happen in mitosis basically because there is no need to do so. \ncrossing over occurs in the 1st part of meiosis  when the 2 pairs of homologous chromosomes come together in the prophase part of meiosis--one pair of chromosomes from each parent. that is where the exhcange of genes occur in order to add variation between the 4 daughter cells.\nin mitosis, the homologous chromosomes do not come together. the DNA simply copies itself and will eventually lead to the split into 2 identical daughter cells.