i want a table of chromosome when its lees than 46 what happened and give me example and the name of desece?
301931
umm, though i'm not sure what the question really says- i think you are asking about genetic diseases involved with chromosome number, if i'm right the following stands, if not then ignore it. \nif you have less or more chromosomes than 46 you will not survive far past fertilization, at least thats what i understand- either that, or you would be a different species- unable to produce a fertile offspring with a human.\n\nHowever there is a lot of confusion around Down's syndrome. This is caused by non-disjunction of chromosomes during meiosis, and creates trisomy genotypes on chromosome 21. \n\nTrisomy and non-disjunction can also occur on chromosome 17- causing another disease, which i have momentarily forgotten the name of. sorry.
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.\nThere will not be normal synapsis during zygotene of meiosis because one chromosome will not have a mate. A child may be born but the chances are that it will not be normal at all. Probably abort before birth. This is for a 47 chromosome male, and a 47 chromosome female, when the extra chromosome is an autosome.\n\nAn XXY is called a Klienfelter syndrome, sperms are usually not produced, breast development is common, voice tend to be higher pitched. The phenotype is male because of the y chromosome. Homosexuality is not mentioned.\n\nThe XXX female is sometimes fertile and can mate with a fertile XY male. There is a possibility that this female can mate with a XYY fertile male. This represents one of the few times a 47 female may mate with a 47 male and have normal children.
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http://en.wikipedia.org/wiki/Chromatin
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Trisomy is a form of aneuploidy where an organism has one extra chromosome in their genone (2n + 1). So a person with trisomy will have 47 chromosome (because a normal human has 46). A common example of trisomy is Down's Syndrome.\n\nThe n in 2n stands for the number of chromosomes in a haploid cell (a gamete, or 'sex cell') of that organism. So for humans it is 23 because a full set of chromosomes (2n) in a human is 46. It's more important to remember the 2n value of a species rather than the n value, which can easily be derived if you know 2n.\n\nMendel introduced the Law of Segregation and the Law of Independent Assortment using pea plants. Any half decent biology book can explain exactly what he did and how he derived these laws.\n\nCrossing over overs during metaphase of meiosis I (or metaphase I). More precisely, but probably not importantly, it actually occurs during prometaphase which is a phase between prophase and metaphase which was derived specifically to differentiate the process of crossing over from everything else which happens in metaphase. The teaching of prometaphase is inconsistent in courses so I would just stick with metaphase I for that answer.\n\nNondisjuction is when two chromosomes stay together instead of splitting up during anaphase, which results in the production of a cell with one extra chromosome and a cell with one less chromosome. This is the primary cause of Down's Syndrome which is related to maternal age, and other types of genetic diseases.\n\nMonosomy is the opposite to trisomy, that is, an organism has a genone with one less chromosome (2n - 1). It occurs just like trisomy. A human with monosomy will therefore have 45 chromosomes.
802332
If the total number of cells you finish with at the end of what I assume is mitosis is 36, then you began with 18 cells, which I suppose is 50%.  Is that at all what you are asking?
602408
if you mean Y Chromosome...then check out this website:\n\nhttp://en.wikipedia.org/wiki/Y_chromosome\n\nThe Y chromosome is "shorter" then the X chromosome.\n\nAlso:\nThere has been higher insidence of a smaller Y choromosome with trisomy 21 (Down Syndrome).
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Mendel's law of independent assortment basically says that each chromosome pair will separate during meiosis individually, regardless of whether the chromosome originated maternally or paternally.  So for example, if there are two pairs of chromosomes, 1 and 2, and each have a maternal and paternal copy (1M, 1P, 2M, and 2P), pairs 1 and 2 will segregate without input from the other pair.  So during meiosis, when the a haploid cell is formed with only one chromosome copy, there are many different combinations that can be formed.  The cell could contain 1M/2M, 1M/2P, 1P/2M, or 1P/2P.  It is easy to see how organisms with more chromosome pairs (humans have 23 pairs, 46 total) will produce more combinations, hence diversity among the species.  Hope that helps!
34335
Totally 46 chromosomes.\n22 pairs will be there and two sex chromosomes will be there.\nIf male, X & Y and If Female X & X.\nSo totally 46.
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Copied from website...\n\nMitosis is responsible for growth and development, as well as for replacing injured or worn out cells throughout your body. For simplicity, we have illustrated cells with only six chromosomes.\nClick for larger image\nInterphase : Chromosomes duplicate, and the copies remain attached to each other. \nProphase : In the nucleus, chromosomes condense and become visible. In the cytoplasm, the spindle forms. \nPrometaphase : The nuclear membrane breaks apart, and the spindle starts to interact with the chromosomes. \nMetaphase : The copied chromosomes align in the middle of the spindle. \nAnaphase : Chromosomes separate into two genetically identical groups and move to opposite ends of the spindle. \nTelophase : Nuclear membranes form around each of the two sets of chromosomes, the chromosomes begin to spread out, and the spindle begins to break down. \nCytokinesis : The cell splits into two daughter cells, each with the same number of chromosomes as the parent. In humans, such cells have two copies of 23 chromosomes and are called diploid.
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Meiosis: -- One cell becomes 4 cells--There are 4 new "daughter" cells. Each new gamete cell contains only one-half of the number of chromosomes of the parent cell. Each sex cell goes through the division process twice in order to have the correct number of cells, and the correct chromosomal information.\n\nMitosis: -- One cell becomes two cells-- The new "daughter" cell has exactly the same number of chromosomes and information as the "parent" cell. 1 cell divides and becomes 2 cells.
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Normal male cells have 23 pairs of chromosomes (1-22 & X+Y) or 46 total chromosomes.
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Nondisjunction.  \n\nNondisjunction occurs when homologous chromosomes fail to separate during meiosis.  This results in two cell with two copies of the chromosome (when it should one have one) and two cells with none (remember that meoisis produces four haploid cells).  If the cell with the extra copy fertilizes/is fertilized by a normal haploid gamete, the result will be a trisomy.  If a cell that's missing its copy of the chromosome combines with a normal haploid cell, there result is monosomy.\n\nThe other three choices (inversion, translocation, and crossing-over) involve changes in sequence, rather than chromosome structure or number.
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If the rest of your question was: "What is the diploid number of chromosomes after synthesis?" Than the answer is still 12 because a haploid cell won't form until mitosis. If you clarify your question, you can get better answers. I'll come back to check.
79598
Both previous answers are inaccurate.\n\nMitosis is sometimes called growth division. In plants and animals new cells are made continually. Mitosis results in two new cells identical genetically to the original which divided.\nWe are diploid animals which have 23 pairs of chromosomes. After mitosis both cells still have 23 pairs of chromosomes.\n\nMeiosis is a division which produces sex cells (sperm or ova). After division is complete, each sex cell has half the number of chromosomes; it is haploid. So instead of having 23 pairs the sex cells will have 23 chromosomes - one of each type of chromosome.
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In every cell of the human body there are 46 chromosomes: 44 somatic coding chromosomes (body coding) and 2 sex chromosomes.\n\nEach chromosome is part of a pair.  Each one of the pair codes for the same thing, though not necessarily the identical way (for example, one of the set may code for blue eyes, one may code for brown eyes). \n\nThe idea of homologous pairs is important during meiosis, when the chromosomes replicate, and find their homologous pairing, forming a tetrad (a structure with 4 chromatids from the joining of 2 replicated homologous chromosomes).\n\nHope this helps.
30981
Yes it is 4. Since the diploid number of chromosomes in a cell is 4, there will be two pairs of homologous chromosomes. During crossing over the homologous chromosomes exchange their genes and hence now we have 4 different chromosmes.
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23 pairs of chromosomes in the human body