DP Biology (first assessment 2025)

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Question SPM.2.SL.TZ0.6a

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Date May Specimen-2023 Marks available [Maximum mark: 2] Reference code SPM.2.SL.TZ0.6a
Level SL Paper 2 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
SPM.2.SL.TZ0.6a
(a)

Outline how sex is determined in humans.

[2]

Markscheme
  1.  genetically determined/determined by (pair of) sex chromosomes/X and Y chromosomes;
  2.  sperm carry either an X or a Y chromosome;
  3.  egg is X and if fertilized by X sperm leads to a female child / XX female
     OR
     egg is X and if fertilized by Y sperm leads to a male child / XY male;

Syllabus sections