CAIE IGCSE Biology 17.4.12 Punnett Squares in Crosses Which Questions
Practise constructing Punnett squares to show all possible genotypes when a cross can produce more than one outcome.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- derive all possible offspring genotypes by combining one allele from each parent in a monohybrid cross
- list each distinct possible offspring genotype without double-counting repeated outcomes
CAIE IGCSE Biology 17.4.12 Punnett Squares in Crosses Which Questions question 1
The four o'clock plant, Mirabilis jalapa, can have flowers of three different colours as shown in Fig. 4.1.
Fig. 4.1
The student then carried out three further crosses as shown in Table 4.1.
Table 4.1
Complete the table by writing in the genotypes of the offspring of crosses 2, 3 and 4, using the same symbols as in the genetic diagram in (a).
You may use the space below for any working.
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