IB Biology SL 2.5.11 Sex determination in humans Question Bank
Practise IB Biology SL 2.5.11 by explaining how the Y chromosome directs development of testes.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain how the presence of a Y chromosome affects embryonic sex development.
- Use probability to analyse sex ratios in offspring.
D3.2.11—Sex determination question 1
[Maximum number: 3]
In eukaryotes, the chromosomes are located in the nucleus, and the nucleus can divide by mitosis or meiosis.
Explain how the presence of a Y chromosome in the cells of a human embryo causes it to develop as a male.
a. gene/genetic information on Y chromosome causes embryo to develop testes;
b. (developing) testes in embryo secrete testosterone;
c. testosterone causes male genitalia/penis to develop;
explain
Marking guidance:
Accept SRY gene in mp-a
[3 max]
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