Q26 · Practice questionSimple familiar1 mark
QUESTION 26
The gel shows DNA fragments from an unknown sample U and three reference samples. Which reference has the same banding pattern as U?
(A)
Reference A
(B)
Reference B
(C)
Reference C
(D)
All three references
WORKED SOLUTION
1 markAnswer B
Answer
B
Working
U and B both have bands at the same four migration distances. A and C each differ at least once. Identical patterns at the tested fragments indicate a match at these fragments, not proof that entire genomes are identical.
Marking criteria
- Select B. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabus