Chromosomes moved faster towards the poles while marked microtubule regions stayed stationary before eventually breaking apart. Therefore, kinetochore microtubules shorten at the kinetochore.




You are watching: What evidence suggests that during anaphase, kinetochore microtubules shorten at the kinetochore?


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Video Transcript

which evidence suggests that during Anna phase kinetic or micro tubules shorting out the kinetic or so what biologists did to answer this question was fluorescent lee labeled the chromosomes and the micro tubules here I've indicated the chromosomes in blue and the Magi bills and red, and the biologists wondered that there are two possible places that the micro tubules could shorten it ashore in here at the spindle pool end Orca Sure in here at the Connecticut Rand, if that if it sure ends at the spectacle than it's sort of like a fishing rod that reels in the line. And if in short and at the kinetic or then that would mean that the micro tubules are deteriorating along the way, bringing in the the chromosome by physically shortening the micro tubules and what they found was by marking a spot on the micro TV. You'll here have indicated that spot in green, but what they did was used a laser to dark in the micro tubules at a certain spot. They found that if it was sort of like the fishing rod hypothesis, then the mark spot would reach the spindle pull first, because it's ahead of the kinetic, or of the of the of the Connector and the Crimson. But if it did hear if the micro tubules shortened at the kinetic, or then the chromosome would reach the spindle poll before the mark spot and the mark spot wouldn't actually move. And that's exactly what they found. They found that the mark spot was stationary and that the chromosome eventually surpassed it and reached its pinnacle first. So what they discovered was that the micro tubules disassemble at the Connecticut or here indicated in black and hitters the chromosome in blue and the two billion molecules actually disassembled right here next to the chromosome and move it along the way. And so that's how they found that the Connecticut mecca trivial, short in at the