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IB Biology HL 3.2.3 Genotype Question Bank

Practise IB Biology HL 3.2.3 by analysing genotype combinations and inheritance outcomes in genetic crosses.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse genotype combinations that produce specified inheritance or phenotype outcomes.
  • Relate heterozygosity and allele location to genetic inheritance evidence.

D3.2.3—Genotype question 1

[Maximum number: 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 genotypes of the soybean plants with high oil content and four seeds in a pod that were used in the cross.

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