IB Biology HL 2.5.10 Multiple alleles and codominance Question Bank
Practise IB Biology HL 2.5.10 by analysing codominance and multiple-allele inheritance across organisms.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse inheritance involving multiple alleles and codominant phenotypes.
- Deduce genotype and phenotype outcomes from complex cross data.
D3.2.10—Incomplete dominance and codominance question 1
[Maximum number: 1]
A variety of Pelargonium has yellow leaves. When plants of this variety are crossed, the resulting seeds produce green, yellow and white seedlings in the ratio 1: 2: 1. If plants with yellow leaves are crossed with plants with green leaves, what would the expected ratio of phenotypes in the offspring be?
Green
Yellow
White
1
2
1
3
1
0
2
2
0
2
1
1
C
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