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DNA from a mother, child and four men (A, B, C and D) in a paternity suit was analysed - Scottish Highers Biology - Question 4 - 2019
Question 4
DNA from a mother, child and four men (A, B, C and D) in a paternity suit was analysed. The DNA was amplified using PCR and separated by gel electrophoresis. From t... show full transcript
Worked Solution & Example Answer:DNA from a mother, child and four men (A, B, C and D) in a paternity suit was analysed - Scottish Highers Biology - Question 4 - 2019
Step 1
Identify the Likely Father of the Child
Answer
To determine the likely father of the child, we analyze the gel electrophoresis results displayed in the diagram. The bands observed for the mother, child, and potential fathers (A, B, C, and D) indicate the presence of genetic markers.
For a child to inherit a specific band, that band must also be present in at least one of the parents. Therefore, we check the bands of the mother and the child, looking for a match with those of the potential fathers.
Upon examination:
- The child shares bands with father D, demonstrating direct inheritance.
- No matching bands were observed with fathers A, B, or C.
Conclusively, based on the presence of matching bands, father D is identified as the likely biological father of the child.