Meiosis Watch

vetboy
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Can anyone give me general differences between mitosis and meosis? I understand meiosis gives us the genetic variation...
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alispam
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this was a q in my jan modules!!! but can i remember the answer? well meiosis has two divisons compared to one in mitosis, during the first meiotic division homologous chromosomes associate whilst in mitosis homologous chromosomes don't. meisosis produces 4 daughter cells from one parent cell compared to 2 daughter cells from one parent cell in mitosis. that's all i can think of at the mo...
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The Orientalist
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Meiosis can give rise to a phenomena called "crossing-over", but I'm not sure If you're supposed to know that lol.
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alispam
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oh yes chiasmata...its because homologous chromosomes stay together, meaning that bivalents (pairs of chromosomes) can get very close during prophase, then chiasmata occurs as the chromosomes cross over, the part where cross over has occurred can break off and reattach to the other chromosome in the pair. hence genetic material is swapped from one chromosone to another - another cause of genetic variation in meisosis
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The Orientalist
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(Original post by alispam)
oh yes chiasmata...its because homologous chromosomes stay together, meaning that bivalents (pairs of chromosomes) can get very close during prophase, then chiasmata occurs as the chromosomes cross over, the part where cross over has occurred can break off and reattach to the other chromosome in the pair. hence genetic material is swapped from one chromosone to another - another cause of genetic variation in meisosis
Lol...exactly!
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Fluffy
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Keeping it basic and simple - Mitosis is somatic cell replication - i.e. one parent cell divides to give two daughters with the same DNA complement.

Meiosis is reduction division [easy way to remember is that meiosis means 'decrease']. You get two consecutive divisions - in the first homologous chromosomes paired at the equator [chiasmata, crossingover, blah, blah ] before separating into 2 daughter nuclei. Then the daughter cells divide by mitosis to produce four haploid nuclei.
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Fluffy
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Here we go: pictures always speak a thousand words...



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alispam
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it depends on which syllabus you are doing as to the details you need...what are you doing?
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vetboy
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aqa biology A
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alispam
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OMG - your the first person i've found on TSR doing the same syllabus as me - every1 else seems to do AQA B! In that case you don't need to know anything that fluffy said about somatic replication (soz fluffy!) stick to stuff about chiasmata and homologous chromosomes associating. Also independant assortment during metaphase 1 of meiosis causes variation - when the chromosomes line up on the equator of the cell which of the chromosome of the pair goes on the 'top' and which goes on the 'bottom' is random.
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~*Sar*~
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(Original post by alispam)
OMG - your the first person i've found on TSR doing the same syllabus as me - every1 else seems to do AQA B! In that case you don't need to know anything that fluffy said about somatic replication (soz fluffy!) stick to stuff about chiasmata and homologous chromosomes associating. Also independant assortment during metaphase 1 of meiosis causes variation - when the chromosomes line up on the equator of the cell which of the chromosome of the pair goes on the 'top' and which goes on the 'bottom' is random.
I'm doin aqa A too
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alispam
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together we shall take over the world.....:ts:
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