DP Biology (first assessment 2025)

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Question 19M.2.SL.TZ2.a.i

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.SL.TZ2.a.i
Level SL Paper 2 Time zone TZ2
Command term Identify Question number a.i Adapted from N/A
a.i.
[Maximum mark: 1]
19M.2.SL.TZ2.a.i

Identify the stage of mitosis labelled X in the image, giving a reason.

[Source: Copyright 2002, The Trustees of Indiana University]

[1]

Markscheme

telophase because the chromosomes/chromatids have reached the poles
OR
«late» anaphase as some chromosomes/chromatids are still moving/tails visible ✔

OWTTE

Examiners report

Both anaphase and telophase were accepted as answers, but students had difficulty providing a reason that was an appropriate justification; for example, students might say telophase and then support this with the statement because chromatids are seen moving to opposite poles. Students sometimes referred to chromatids as homologous chromosomes. As this is an image of plant cells, students would be mistaken by referring to a cleavage furrow. The mechanism of cytokinesis involves the formation of a cell plate.

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