DP Biology (last assessment 2024)

Test builder »

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

Select a Test
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.

Examiners report

The greatest success occurred with (a) as most candidates were able to describe the events of mitosis even though the names of the stages might be incorrect. As names of stages were not required, the sequencing of events was successful.

Syllabus sections