DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ1.c

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Date May 2023 Marks available [Maximum mark: 3] Reference code 23M.2.SL.TZ1.c
Level SL Paper 2 Time zone TZ1
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
23M.2.SL.TZ1.c

Explain how the presence of a Y chromosome in the cells of a human embryo causes it to develop as a male.

[3]

Markscheme
  1. gene/genetic information on Y chromosome causes embryo to develop testes;
  2. (developing) testes in embryo secrete testosterone;
  3. testosterone causes male genitalia/penis to develop;

 

Accept SRY gene in mp-a

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