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More than one celled organisms grow by way of mitosis and the cytoplasmic division of body cells On the other hand meiosis occurs only in germ cells which are put aside for the formation of gametes sperm and egg Reproduction by meiosis allows for species survival and it increases genetic variability The process during which the germ cells are generated is called meiosis It represents natures solution to the problem of chromosome doubling that would occur if two diploid cells ie two cells with a double set of chromosomes would fuse Accordingly does meiosis produce haploid germ cells with maternal and paternal germ cell fusing at fertilization and thus generating a diploid fusion product the zygote Meiosis is made up by two subsequent processes both of which resemble mitosis In the first process are the homologous chromosomes separated It has an unusually long prophase that is subdivided into different stages They are followed by metaphase anaphase and telophase Two nuclei fuse upon fertilization so that the number of chromosomes does necessarily double If this thought is spun further would an greater growth of the number of chromosomes from generation to generation have to be expected This is not the case because the chromosomes are reduced to half their normal number in germ cell production This process is called meiosis It consists of two successive mitosis-like divisions in the first division is the number of chromosomes reduced to their half the second is a normal mitosis Each germ cell contains a complete set of chromosomes a haploid set Accordingly are the cells haploid and zygotes and the body cells that stem from them are diploid because they contain two equal sets of chromosomes one from the mother and one from the father They exist especially in plants At the beginning of meiosis in prophase 1 the plate breaksdown and chromosomes become visible as in mitosis 1 The chromosomes have replicated but individual chromatids are
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