DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ1.6a

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Date May 2023 Marks available [Maximum mark: 5] Reference code 23M.2.SL.TZ1.6a
Level SL Paper 2 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 5]
23M.2.SL.TZ1.6a
(a)

Outline the sequence of events that occurs during mitosis.

[5]

Markscheme
  1. supercoiling/condensation of chromosomes;
  2. breakup of nuclear membrane;
  3. growth of spindle/microtubules;
  4. attachment of spindle/microtubules to chromosomes/centromeres;
  5. chromosomes line up at the equator/middle
  6. division of centromeres;
  7. separation of sister chromatids/chromosomes
    OR
    sister chromatids/chromosomes move to opposite poles;
  8. reformation of nuclear membranes around chromosomes at each pole;

 

If events are not in the correct order, then award a maximum of 4 marks.

Names of phases of mitosis not required.

Award a max of 1 mark for listing the phases in the correct order when the list constitutes the entire response.

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