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When was the mechanism behind cytokinesis first discovered?

(a) 1950s

(b) 1960s

(c) 1970s

(d) 1980s

I have been asked this question by my college director while I was bunking the class.

The above asked question is from Cellular Reproduction in portion DNA Replication and Repair, Cellular Reproduction of Cell Biology

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The correct answer is (a) 1950s

To explain I would say: In 1950s, the proposal made by Douglas Marsland known as the contractile ring theory is responsible for the current understanding of mechanism behind cytokinesis. He proposed that the force required to cleave the cell resides in the cortex, just beneath the furrow of dividing cell.

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