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During an investigation a DNA profile was carried out in order to match a DNA sample from a crime scene with a sample from a suspect - Leaving Cert Biology - Question 5 - 2022

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During-an-investigation-a-DNA-profile-was-carried-out-in-order-to-match-a-DNA-sample-from-a-crime-scene-with-a-sample-from-a-suspect-Leaving Cert Biology-Question 5-2022.png

During an investigation a DNA profile was carried out in order to match a DNA sample from a crime scene with a sample from a suspect. The diagram shows the DNA profi... show full transcript

Worked Solution & Example Answer:During an investigation a DNA profile was carried out in order to match a DNA sample from a crime scene with a sample from a suspect - Leaving Cert Biology - Question 5 - 2022

Step 1

Which suspect DNA profile, A or B or C matches the DNA sample from the crime scene?

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Answer

The DNA profile that matches the crime scene sample is Profile B. This can be determined by visually comparing the bands of the DNA profiles from the crime scene and suspect B, which show clear correspondence.

Step 2

Place each of the numbers 1, 2, 3, 4 in the correct box below to show the correct sequence of events when creating a DNA profile.

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Answer

  1. (iii) DNA is released from cells using detergent.
  2. (iv) DNA is cut into fragments using enzymes.
  3. (i) Separate DNA fragments based on their sizes.
  4. (ii) Analyse pattern of fragments.

Step 3

Name any one pair of these bases.

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Answer

One pair of bases in DNA is Adenine-Thymine (A-T) or Cytosine-Guanine (C-G).

Step 4

State one other application for DNA profiling.

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Answer

One other application for DNA profiling is paternity testing.

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