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CAIE A-Level Biology 19.1.9 Gel Electrophoresis

Practise explaining DNA-fragment separation in an electric field and interpreting bands, controls and ladders to identify alleles or estimate fragment length.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • explain why negatively charged DNA moves to the anode through the gel matrix
  • link shorter fragment length to faster migration and a greater distance from the wells
  • compare bands with ladders or controls to infer fragment size, allele or genotype

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