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Question 22M.2.HL.TZ2.a.i

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.HL.TZ2.a.i
Level HL Paper 2 Time zone TZ2
Command term Identify Question number a.i Adapted from N/A
a.i.
[Maximum mark: 2]
22M.2.HL.TZ2.a.i

The onion (Allium cepa) root cells shown in the micrograph are in different stages of mitosis.

[Source: Reischig, J., 2014. Mitosis (261 13) [Pressed; root meristem of onion]. [image online] Available at https://commons.wikimedia.org/wiki/File:Mitosis_(261_13)_Pressed;_root_meristem_of_onion_(cells_in_prophase,_metaphase,_anaphase,_telophase).jpg   This file is licensed under the Creative Commons Attribution -ShareAlike 3.0 Unported (CC BY-SA 3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en [Accessed 3 December 2019].]

Identify, with a reason, the stage shown at X.

[2]

Markscheme
  1. anaphase;
  2. the (replicated) chromosomes/chromatids are separating/moving to opposite poles of the cell;

OWTTE

Examiners report

This question was generally well done; a few identified the incorrect phase of mitosis, but the observations about cellular events being observed was often correct.

Syllabus sections