IB Biology HL 3.2.5 Dominant and recessive alleles Question Bank
Practise IB Biology HL 3.2.5 by analysing complex inheritance crosses, lethal alleles and genetic-disorder probabilities.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse inheritance ratios involving heterozygosity, lethal alleles and sex-linked or autosomal conditions.
- Evaluate Punnett-grid evidence to calculate genetic-disorder and phenotype probabilities.
D3.2.5—Dominant and recessive alleles question 1
[Maximum number: 1]
Huntington's disease is an autosomal dominant genetic disease. What are the chances of two parents that are heterozygous for the gene having a child with Huntington's disease?
A
25 %
B
50 %
C
75 %
D
100 %
C
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