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 activation of the Y-chromosome SRY gene as the trigger for embryonic testis development.
- Distinguish autosomes from XX/XY sex chromosomes and compare the genes carried by X and Y.
- Select the X and Y chromosome plus testosterone combination in a fetal-development table.
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
D
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