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IMSO 2021 Science International - Theory I Question 15

IMSO Science · IMSO 2021 Science International - Theory I

Question 15

(15) Agarose gel electrophoresis is a laboratory method used to separate DNA by size. In a gel electrophoresis, DNA molecules migrate from one end of the gel to the other end, where lighter molecules migrate faster than the heavier ones.

The parents of a new baby believe they brought the wrong child home from the hospital. Gel electrophoresis was performed using DNA samples from the parents and the child. A section of the gel electrophoresis results is shown below.

Which conclusion is valid based on the results? [1 mark]

Question illustration
  1. They have the correct child, because her genetic information is identical to that of the father.
  2. They have the wrong child, because her genetic information does not match that of either parent.
  3. They have the correct child, because her genetic information came from both parents.
  4. They have the wrong child, because her genetic information matches only that of the mother.