Both are types of cell division. Meiosis is when the sex cells divide during reproduction. Mitosis is for cell growth and repair. When a cell divides by meiosis, the daughter cell only has 23 chromosomes. When a cell divides by mitosis, the new cell has 46 chromosomes, just like the parent cell.
2007-01-15 16:50:27
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answer #1
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answered by Jon's Mom 4
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meiosis is a process of cell division in germ cells .
in this process reductional division takes place
therefore chromosome no. is not retained in the daughter cell as that of parent whereas in mitosis its not the case
we get the formation of 4 cells from one cell while in mitosis its 2 cells for 1
we find crossing over taking place in meiosis while in mitosis it doesn't
2007-01-16 05:29:38
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answer #2
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answered by max_pratik 2
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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.
Meiosis is essential for sexual reproduction and therefore occurs in many 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.
During 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.
Biochemically, 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.
2007-01-16 00:52:01
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answer #3
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answered by tnbadbunny 5
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http://en.wikipedia.org/wiki/Meiosis
http://en.wikipedia.org/wiki/Mitosis
2007-01-16 00:49:32
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answer #4
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answered by Anonymous
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http://education.yahoo.com/reference/encyclopedia/entry/meiosis
http://education.yahoo.com/reference/encyclopedia/entry/mitosis
2007-01-16 00:49:43
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answer #5
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answered by Sxoxo 5
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www.studybuddy.com
GO THERE!!
2007-01-16 00:51:07
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answer #6
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answered by heyhhc 2
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