There was a mix-up in the hospital nursery and there is a question as to which baby belongs to a set of new parents. The given gel contains the DNA fingerprint of the new mother (Lane 1), the new father (Lane 2), and two infants (Lanes 3 and 4). The DNA fingerprinting indicates that the infant tested in Lane _____ is the child of these parents.

DNA fingerprinting is a technique where the DNA is made separated based on the molecular weight when run in a gel. Since the DNA is negatively charged the DNA the current is passed from the negative to the positive terminal.

Similar bands are found between closely related individuals. The genetic makeup of the offspring usually contains combined bands from both parents.

In question lane 4 (infant 2) of the gel does not contain similar bands to that of the parents whereas in lane 3 (infant 1) all the bands match either the mother or father. These similar band patterns confirm that the lane 3 child belongs to the parents.

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