IB Biology SL D3.2.10 Incomplete dominance & codominance
IB Biology SL D3.2.10 Incomplete dominance & codominance

IB Biology syllabusFirst assessment 2025
Practise recognising incomplete dominance and codominance from crosses, phenotype ratios and examples such as flower colour and feather pattern.
How this is tested
- distinguish blended heterozygote phenotypes from both alleles being expressed
- predict F1 and F2 phenotype ratios from red, white and pink flower crosses
- apply inheritance patterns to feather or seedling colour data in unfamiliar crosses
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