DP Biology (first assessment 2025)

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Question 19M.2.SL.TZ1.c.i

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.SL.TZ1.c.i
Level SL Paper 2 Time zone TZ1
Command term Identify Question number c.i Adapted from N/A
c.i.
[Maximum mark: 1]
19M.2.SL.TZ1.c.i

Identify, with a reason, the sex of this individual.

[1]

Markscheme

male because «X and» Y chromosome present
OR
male because sex chromosomes/last two chromosomes/pair 21 are unpaired/different «from each other»/not homologous ✔

The answer must include “male” and the reason.

Examiners report

90 % of candidates correctly identified the individual as male, because the two sex chromosomes were different in size so must be an X and a Y. The other 10% mostly thought that there were two X chromosomes present, perhaps because pair 20 were X shaped.

Syllabus sections