The crossing over of sister chromatids?

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monochromatic10
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The crossing over of sister chromatids?

Post by monochromatic10 » Sat Oct 02, 2010 9:48 pm

Does the crossing over of sister chromatids mean that the chromosomes overlap each other to exchange genetic information or do they have to actually exchange parts to produce a genetic recombination?In my textbook, it says that it has something to do with the proteins making the chromatids "overlapping" each other, which greatly corresponds to just the name of the action. But on the internet, some sources say that the chromatids don't "stick" together, but they exchange parts, which is more similar to the definition of crossing over. And also, why does the crossing over of sister chromatids occur in the late prophase stage of Meiosis I? I would really like your help on this. :D

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