Note : Consider the y axis as 1,2,3,4(not 2,3,4) and x axis as time. Roman numerals should be considered from I-X ( some are not correct here )
Which stages show mitosis?
My answer : III-V
Which stages show meiosis?
My answer : VII-X
Am I right ?
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2$\begingroup$ I think there is no problem in your arguments. The part IV-V can also be considered a part of interphase (G1 phase), and not mitosis, though it is still ambiguous in the diagram. $\endgroup$– stochastic13Commented Nov 18, 2013 at 14:49
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2$\begingroup$ @SatwikPasani Could you post this as an answer? $\endgroup$– canadianerCommented Apr 1, 2015 at 21:50
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2 Answers
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I believe III → IV is mitosis and VII → X would be meiosis. As Jam explained in comments below, the stationary points of the graph (II → III or VI → VII ) do not count as part of either process.
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$\begingroup$ DNA is replicated during interphase, not mitosis. So I → II cannot be part of mitosis. $\endgroup$– JamCommented Dec 12, 2018 at 0:21
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$\begingroup$ Ah I see where I went wrong. Would II to IV and VI to X be correct? $\endgroup$– LilyCommented Dec 12, 2018 at 0:31
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$\begingroup$ I think III → IV and VII → X would be the right answer. The gap between II → III is referred to as a separate phase outside of mitosis (G2, which is part of interphase). It might seem redundant since it looks like nothing's actually happening on the graph between II → III or VI → VII (and I can see why you'd suggest starting there) but there are other cellular processes that happen during these gap phases :) $\endgroup$– JamCommented Dec 12, 2018 at 0:40
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$\begingroup$ Penny has dropped, thank you that is very helpful! :) $\endgroup$– LilyCommented Dec 12, 2018 at 0:45
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$\begingroup$ Np - If you edit your answer, I can upvote it. The site won't let me change my previous vote until the answer is edited. $\endgroup$– JamCommented Dec 12, 2018 at 0:47
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From your question I can conclude that if you consider only chromosome number changes (excluding DNA and Chromatid number changes, which would dramatically change the graphical interpretation):
• I to II would represent anaphase (note chromosome doubled in a single cell)
•II to III would represent karyokinesis
•III to IV would be cytokinesis ( note the chromosome number returns to its initial for the given cell taken into consideration)
•IV to V would be a complex of interphase , prophase and metaphase
• V to VI can be again anaphase
• I have interpreted that from VI to VII there has been a chromatid doubling but the number of chromosome remains same
•Steps VII to X are clearly the steps of meiosis
So to conclude steps I to VI are mitosis and VII to X are meiosis
