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IB Biology HL D3.2.11 Sex Determination Questions

Explain how the Y-chromosome SRY/TDF signal and XX/XY chromosome combinations determine human chromosomal sex in IB Biology HL D3.2.11.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify the Y-chromosome SRY/TDF signal that activates testis development and distinguish it from autosomal chromosome content.
  • Distinguish autosomes from X and Y sex chromosomes using chromosome content and the XX/XY combinations that determine human chromosomal sex.

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Study D3.2.11—Sex determination conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D3.2.11 Sex Determination Questions question 1

[Maximum number: 1]

What causes gonads to develop as testes in humans?

A

Effect of placental hormones

B

Initiation of testosterone secretion in puberty

C

Development of secondary sexual characteristics

D

Activation and transcription of a gene on the Y chromosome

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