IB Biology HL 3.2.4 Phenotype Question Bank
Practise IB Biology HL 3.2.4 by interpreting phenotype ratios and connecting them to genotype combinations.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse phenotype ratios to identify the characteristics represented by each outcome.
- Relate phenotype frequencies to allele combinations and inheritance patterns.
D3.2.4—Phenotype question 1
In a strain of soybeans, high oil content (H) in seeds is dominant to low oil content (h) and four seeds in a pod (F) is dominant to two seeds in a pod (f). A farmer crosses two soybean plants, both with high oil content and four seeds in a pod. The offspring have a phenotypic ratio of 9: 3: 3: 1.
Identify the phenotypes of each part of the phenotypic ratio.
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