Meiosis in haploid cell, mitosis in haploid cell?
964980
The other answers are good, but not completely correct.\n\nA diploid or haploid cell can go through mitosis to make an itendical copy of the original.\n\nOnly a diploid cell can go through meiosis.  One diploid cell creates FOUR haploid cells, unlike the first answer said.  Each of these four haploid cells has half the number of chromosomes as the original diploid cell.  In humans, this is what makes the gametes, sperm and egg.  When a sperm fertilizes an egg, the two cells combine and form a diploid cell with the diploid amount of chromosomes.
947432
It is definitely the chromosomes that divide in both mitosis and meiosis. However, the whole cells divides so # 1 sounds like the right answer. Did you ask in class? I am glad you are asking here , but you really should ask your teacher.
839769
Meiosis is specialized cell division (similar to mitosis). Mitosis results in 2 identical daughter cells from a single cell. Meiosis results in 4 daughter cells (which may not be identical) but each daughter cell only has one set of chromosomes, instead of the 2 sets of chromosomes present in the original cell. Each of these daughter cells is called a gamete. In sexual reproduction a male gamete and a female gamete (sperm and egg) fuse. Each contributes a single set of chromosomes so the resulting fused cell (zygote) has two sets like the cells that originally formed the gametes.
834627
meiosis ensures that each gamete is a haploid (i.e. has half, or n, chromosomes of a normal cell). when the gametes fuse the zygote becomes 2n like a normal cell. Mitosis produces daughter cells which both have 2n, and these cannot be present in the gametes or else the zygote would have 4n!
264517
Meiosis, as the name implies is a reduction division. That is at the end of it the chromosome number is reduced to half the original number; from diploid to haploid.\nThus, it can occur only in diploid cells, haploid can never undergo meiosis.\nIt occurs during gamete formation, spore formation or zygote germination. It is the nature’s mechanism by means of which the chromosome number and the quantity of DNA remains constant from one generation to the next.\n What happens before meiosis? – Chromosome duplication occurs before the cell begins to divide; the DNA content of the nucleus doubles.\nWhat is produced after the first division? – Two daughter nuclei are produced at the end of it. The chromosome number is reduced to half in each one of them; i.e. they are, now, haploid. But the DNA content is not exactly halved. \nWhat is produced after the second division? - The second meiotic division is the same as mitosis. From two daughter nuclei in the earlier phase four daughter nuclei are produced. The chromosome number is already reduced, now the DNA quantity is also reduced to half of that present in the original parental cell.\nThus the four cells at the end of meiosis are haploid and DNA is also half of the original parental cell. Thus the products are different than the one at the end of mitosis. Besides, the genes are also different and not identical on all the four cells.  \n What can go wrong? – Many things can go wrong and it will be difficult to explain them here.\n1) Chromosome pairs may fail to separate properly, leading to chromosomal imbalance in the resulting cell. This in turn can produce genetic defects or variations in the next generation.
626233
Mitosis allows the chromosomes in a cell to be duplicated so that a new cell can be formed. \nMeiosis uses the same concept except that you end up with four haploid( half the # of chromosomes) gametes, or reproductive cells because of the second half of the meiosis cycle. When these cells(either egg-sperm, pollen-seed, ect) come together, they form a diploid cell(twice the # of chromosomes as the haploid cell), which then has the number of chromosomes needed for the organism to grow and the species continue on. This also results in different combinations of genes, unlike mitosis, so there is some individuality amoung members of that species.
885418
D is definitely the false answer because, in Meiosis I, the homologous chromosomes are seperated. The chromosomes are divided in Meiosis II. The seperating of the two homologous chromosomes into different daughter cells cause the number of chromosomes to be halved.\n\nE is definitely correct because the daughter cells are different from each other due to cross-over and also because of the seperation of homologous chromosomes.
728867
In biology, meiosis is the process that allows one diploid cell to divide in a special way to generate haploid cells in eukaryotes. The word "meiosis" comes from the Greek meioun, meaning "to make smaller," since it results in a reduction in chromosome number.\n\nMeiosis is essential for sexual reproduction. It therefore occurs in most eukaryotes, including single-celled organisms. A few eukaryotes, notably the Bdelloid rotifers, have lost the ability to carry out meiosis and acquired the ability to reproduce by parthenogenesis. Meiosis does not occur in archaea or prokaryotes, which reproduce by asexual cell division processes.\n\nDuring meiosis, the genome of a diploid germ cell, which is composed of long segments of DNA called chromosomes, undergoes DNA replication followed by two rounds of division, resulting in haploid cells called gametes. Each gamete contains one complete set of chromosomes, or half of the genetic content of the original cell. These resultant haploid cells can fuse with other haploid cells of the opposite gender or mating type during fertilization to create a new diploid cell, or zygote. Thus, the division mechanism of meiosis is a reciprocal process to the joining of two genomes that occurs at fertilization. Because the chromosomes of each parent undergo genetic recombination during meiosis, each gamete, and thus each zygote, will have a unique genetic blueprint encoded in its DNA. In other words, meiosis is the process that produces genetic variation.\n\nBiochemically, meiosis uses some of the same mechanisms employed during mitosis to accomplish the redistribution of chromosomes. There are several features unique to meiosis, most importantly the pairing and recombination between homologous chromosomes, which enable them to separate from each other.click here:http://en.wikipedia.org/wiki/Meiosis#History\n\nMitosis 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.\n\nMitosis 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. Prokaryotic cells, which lack a nucleus, divide by a process called binary fission.\n\nBecause cytokinesis usually occurs in conjunction with mitosis, "mitosis" is often used interchangeably with "mitotic phase". However, there are many cells where mitosis and cytokinesis occur separately, forming single cells with multiple nuclei. This occurs most notably among the fungi and slime moulds, but is found in various different groups. Even in animals, cytokinesis and mitosis may occur independently, for instance during certain stages of fruit fly embryonic development.\n\nTranscription 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.click here:http://en.wikipedia.org/wiki/Mitosis#Overview
994147
its meiosis.\nthe mature sex cell on the walls of the epididymis doubles its chromosome number, then splits twice to form 4 haploid cells
880665
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.
480102
>meiosis (mīŏ'sĭs) , process of nuclear division in a living cell by which the number of chromosomes is reduced to half the original number. Meiosis occurs only in the process of gametogenesis, i.e., when the gametes, or sex cells (ovum and sperm), are being formed. Because fertilization consists of the fusion of two separate nuclei, one from each of the sex cells, meiosis is necessary to prevent the doubling of the chromosome number in each successive generation. An ordinary body cell is diploid; i.e., it contains two of each type of chromosome. The members of each pair are known as homologous chromosomes. An ovum or sperm is haploid; i.e., it contains only a single chromosome of each type and, therefore, half the number of chromosomes of the diploid cell. When the two haploid cells fuse, the diploid number is restored, and the plant or animal growing from the fertilized egg (zygote) has the usual diploid number of chromosomes in its cells. Just before meiosis each chromosome replicates to form two identical copies in the form of strands called chromatids joined together at a point called the centromere. In the first stage of meiosis, called the reduction division, the members of each pair of homologous chromosomes lie side by side and crossing over occurs. Each member of the pair then moves away from the other toward opposite ends of the dividing cell, and two nuclei, each with the haploid number of double-stringed chromosomes, are formed. Thus at the beginning of the second meiotic sequence, called the equational division, each cell nucleus contains one chromosome from each homologous pair and each chromosome is of two strands that are identical (except where crossing over has occurred). Then the chromosomes separate into their single strands which move toward opposite ends of the dividing nucleus. The result of meiotic division is four cells, each haploid, with one chromosome of each pair.\n\n>meiosis (meye-oh-sis) \nDivision of cells in which four “daughter” cells are produced from one “parent” cell, each with half the genes of the parent. Meiosis is a key process in sexual reproduction. In the ovaries and testes, meiosis produces a great variety of sex cells (sperm and ova), because the genes of the parent cell can be split in many different ways. The sex cells combine in fertilization to produce a new individual with the full number of genes — half from each parent. Because the sex cells come in such variety, and come from two parents, there is an enormous number of possible forms for the offspring. (See chromosomes, genetics, and mitosis.) \n\n>mei·o·sis (mī-ō'sĭs)\nn., pl. -ses (-sēz').\nThe special process of cell division in sexually reproducing organisms that results in the formation of gametes, consisting of two nuclear divisions in rapid succession that in turn result in the formation of four gametocytes, each containing half the number of chromosomes that is found in somatic cells.\n\n>meiosis: \nIn biology, 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 sets of 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\nBiochemically
797650
2 cell divisions\nMeiosis I and Meiosis II
825948
Penguin says >>\n\nOogenesis is the process of females creating egg cells... When women are born, they have a lot of cells that of those egg cells, only a few will undergo meiosis and form egg cells. Meiosis, yes, does form four haploid cells from each one of those "pre-made egg cells". All those four haploid cells has 23 chromosomes. However, Meiosis only ensures that there are enough chromosomes for the offspring, and not necessarily the quality of the egg cell... \n\nWhat I mean is >> The larger egg cell containing more cytoplasm lives, while the other doesn't develope into an ovum. \n\nIn Meiosis I, the original cell divides into two, with 46 chromosomes. Meiosis does not seperate into two equal cells, as they do in mitosis. The larger cell then splits again [Meiosis II], and of the two haploid cells that result from Meiosis II, the larger one lives again. So, only one gamete is formed, though of the 4 haploids, 3 of the haploids degenerate. \n\n-- Cytokinesis isn't part of mitosis...Mitosis is part of the cell cycle, which has 3 steps :: interphase, mitosis, and cytokinesis. \n\nRemember that mitosis is the process of splitting a cell's nucleus. \n\nand remember that cytokinesis only splits two cells in half by pinching the cell membrane...\n\nSo... there's a difference. \n\nThank -you-\n\n<< Penguin waves good bye.
1104180
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
852306
Most mitotic cell divisions do result in daughter cells that are equal in size to the parent. During interphase, the cellular material, like cytoplasm, is duplicated as well as the genetic material. This is not the case for meiotic cell divisions, though, which yield cells that are certainly smaller than the parents, about 1/4 the size, and it is not always the case in mitosis, like for example, in the developing blastula.
60422
n MITOSIS, the 2 cells that come out of the division (lets call them the daughters), are EXACTLY the same in genetic makeup as the original mother cell. They have the very same DNA and therefore make the same proteins and therefore the cells behave the same.In MEIOSIS on the other hand, the cells are not the same at all. And in fact, this is the point of meiosis - to make new types of cells. You may know that eggs and sperm are products of meiosis, but you not only get a mixing of genes from your mother (from the egg) and father (from the sperm), but the genes inside the egg and sperm are pre-mixed because of meiosis. Thus, genetic diversity!, and an explanation for why you have traits given to you from your grandmother through your father, even though your father may not have that trait (he carries it in his genes for later mixing). This may be a complicated issue in itself but since we have 2 of every chromosome and therefore 2 of every gene (even before the DNA replication that preceeds mitosis), there's a chance that the 2 copies of the same gene are different, one of which shows up in your father and one which you have that you got from your grandmother throuh your father. The mixing, by the way comes about because after the DNA replicates in preparation for cell division. This is neat and involves chromosomes breaking apart and joining back together. Take a look at the animated movie of meiosis at http://www.biology.yale.edu/animatedMeiosis.nclk  - make a point to notice the red and green chromosomes at the beginning and the mixed ones at the end.
363119
Haploid\nHaploid cells bear one copy of each chromosome.\n\nMost fungi, and a few algae exist as haploid organisms. Male bees, wasps and ants are also haploid. For organisms that only ever have one set of chromosomes, the term monoploid can be used interchangeably with haploid.\n\nPlants and other algae switch between a haploid and a diploid or polyploid state, with one of the stages emphasized over the other. This is called alternation of generations. Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote, for example animals are primarily diploid but produce haploid gametes. During meiosis, germ cell precursors have their number of chromosomes halved by randomly "choosing" one homologue, resulting in haploid germ cells (sperm and ovum).\n\n\nDiploid\nDiploid cells have two copies (homologs) of each chromosome (both sex- and non-sex determining chromosomes), usually one from the mother and one from the father. Most somatic cells (body cells) of complex organisms are diploid