Dictionary » C » Chiasma


ChiasmaThe point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over like the letter X.

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Meiosis prophase I crossover

... Question: Due to the multiple layers of winding, how can parts of the chromosome break evenly? Is it possible that the winding mechanism provides chiasma (break) points in advance? Like “tear along this line”? Perhaps a chromosome has many segments of multiple wound layers (B and C) with a simpler ...

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by gs99
Fri Mar 07, 2014 9:23 pm
Forum: Molecular Biology
Topic: Meiosis prophase I crossover
Replies: 0
Views: 4933

Re: Brain and Body

... As MrMistery said vision is complicated..and doctors can locate tumors based on abnormal vision.For example tumor that makes pressure on optic chiasma would destroy nasal fibers from retinas and thus both temporal visual fields.

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by zami'87.
Thu Nov 12, 2009 7:52 am
Forum: Human Biology
Topic: Brain and Body
Replies: 8
Views: 5869

Some problems about nomenclature.

... But they must have also thought that chromosomes undergoing crossovers looked something like the Greek letter chi, because that’s where the word chiasma (pl chiasmata) comes from; shaped like a chi.

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by blcr11
Fri Jun 01, 2007 4:51 pm
Forum: Botany Discussion
Topic: Some problems about nomenclature.
Replies: 3
Views: 3259

location of chromosomal cross over

Where do the chiasma of chromosomal crossovers occur? Are they mostly random or mostly induced? I briefly read of crossover-hotspot-instigator (chi) sequences, which encourage crossover at those points, and also that crossovers ...

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by tucki
Mon May 07, 2007 6:55 am
Forum: Genetics
Topic: location of chromosomal cross over
Replies: 1
Views: 2133

Meiosis/Mitosis questions

... parent cell. (I think True) 3. DNA replication occurs during both mitosis and meiosis. (I think false. It occurs before mit/mei in interphase?) 4. Chiasma formation occurs during meiosis but not mitosis (True) 5. In both mitosis and meiosis, chromosomes are at their most compacted at metaphase. ...

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by take_no_prisoners
Sat Apr 07, 2007 5:25 am
Forum: Cell Biology
Topic: Meiosis/Mitosis questions
Replies: 10
Views: 6450
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