Question

A DNA system that is used to trace ancestral lineage in forensic science is called:

• A. Alu repeats
• B. Adipocere
• C. Lineage detection
• D. Latent ancestry

Hint:

Alu elements are human-specific repetitive DNA sequences and are widely used in forensic anthropology and evolutionary studies.

Answer 1

The Correct Option is A

Concept:
• Forensic genealogy relies on specific segments of DNA that remain stable over generations.
• Alu elements are a type of transposable element that are unique to the human genome.
• They are approximately 300 base pairs long and have been used extensively to study human population history.

Step 1: Analyzing Alu Repeats
Alu elements are SINEs (Short Interspersed Nuclear Elements). Because the insertion of an Alu element at a specific location is a unique event in evolutionary time, individuals sharing the same insertion are considered to have a common ancestor. Forensic scientists use these "Alu insertion polymorphisms" to determine geographical or ethnic ancestry.

Step 2: Evaluating other options
Option (B) Adipocere: This is "grave wax" formed by the decay of body fat in moist conditions; it is not a DNA system. Option (C) Lineage detection: This is a general phrase describing a goal, not a specific biological system or marker. Option (D) Latent ancestry: This is not a recognized forensic DNA terminology.

Step 3: Conclusion on the technical term
The specific DNA markers used for population and lineage tracing in this context are Alu repeats.