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
[Maximum number: 1]
A person who is homozygous for the sickle cell allele has a child with a person that is heterozygous.
What is the likelihood that the offspring would be homozygous for the sickle cell allele?
A
100 %
B
75 %
C
50\%
D
25 %
C
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