Page 70 - CB1.3 Genetic Varation sciPAD

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70 CB 1.3 GENETIC VARIATION
USING KNOWLEDGE OF GENETICS
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DNA Profiling and Paternity
A paternity test is a technique used to determine the father of a child. A paternity test based on
DNA profiling is the most accurate method of establishing whether or not a person is the biological
father of a child.
Paternity tests use the same electrophoresis technology, but with one small difference. Because
children inherit half of their DNA from each parent, they will possess a combination of both. DNA
fragments from the child should also be present in the fragments from the mother and the father.
FEMALE CHILD MALE 1 MALE 2
1. State which father is the parent of the child. 
Determining Paternity
1. Use a blue pen to circle the DNA fragments that are found in both the mother and
the child.
2. Use a different coloured pen to circle the DNA fragments that are found in both
the child and ‘Male 1’.
3. Repeat step 2 for ‘Male 2’.
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