Answers GCS 2025-2026 Biology Credit Recovery Unit Test — Unit testQuestion 3

3

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Unit Test — Unit test

Question 3 • GCS 2025-2026 Biology Credit Recovery

How is mitochondrial DNA (mtDNA) typing used in forensic science?

Answer

A

A suspect’s mtDNA sample is matched to an unknown sample of nuclear DNA that was found at a crime scene.

B

A suspect’s mtDNA sample is matched to an unknown sample of mtDNA that was found at a crime scene.

C

A suspect’s nuclear DNA sample is matched to an unknown sample of nuclear DNA that was found at a crime scene.

D

A suspect’s nuclear DNA sample is matched to an unknown sample of mtDNA that was found at a crime scene.

Explanation

Mitochondrial DNA typing compares mitochondrial DNA from a person with mitochondrial DNA recovered from crime-scene evidence. The DNA types must match: mtDNA is compared with mtDNA, not nuclear DNA. Therefore, the correct choice is matching a suspect’s mtDNA sample to an unknown crime-scene mtDNA sample.

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