IB Biology SL D1.1.5 Applications Questions
Explore STR and gel-band evidence, PCR-supported profiling and justified paternity or forensic conclusions in IB Biology SL D1.1.5.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain why a child shares approximately half of its DNA markers with each biological parent in a paternity profile.
- Compare crime-scene, suspect or family DNA band patterns to identify a matching profile.
- Outline a DNA-profiling application using PCR amplification, restriction/fragment separation and band evidence for a justified conclusion.
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IB Biology SL D1.1.5 Applications Questions question 1
[Maximum number: 5]
Describe the application of DNA profiling to determine paternity.
a. DNA from child, mother and possible father(s) used to establish paternity;
b. (DNA profiling is done) for legal reasons / divorce / inheritance;
c. (DNA profiling is done) for personal reasons / self-esteem issues for children/fathers/parents;
d. DNA copied/amplified using PCR;
e. DNA cut using restriction enzymes;
f. (gel) electrophoresis used to separate DNA fragments;
g. pattern of bands is produced (in gel);
h. analysed for matches between child with mother and possible father;
i. (about) half the child's bands will match the father (while the other half will match the mother);
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