CAIE IGCSE Biology 17.4.11 Genetic Diagrams to Predict Questions
Practise using genetic diagrams to predict monohybrid cross results and calculate 1:1 or 3:1 phenotypic ratios.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- use genetic diagrams to predict the results of monohybrid crosses
- calculate phenotypic ratios limited to 1:1 and 3:1
CAIE IGCSE Biology 17.4.11 Genetic Diagrams to Predict Questions question 1
Fig. 2.1 shows a dwarf sunflower and a tall sunflower, Helianthus annuus. The height of the dwarf sunflower is 0.45 m and the height of the tall sunflower is 4.5 m .
not to scale
Dwarf plants like the one in Fig. 2.1 have mutant alleles.
Two tall sunflower plants were crossed. 25\% of the offspring produced were dwarf.
Explain how it is possible for two tall parent plants to have this percentage of dwarf offspring.
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