Multiple choice

Consider the following features of DNA (1) DNA is a large molecule in human cells and contains the genetic information about that person. (2) The chemical composition of DNA of an individual is rarely found in another person. (3) Excepting the identical twins, no two persons are the same on the basis of the chemical composition of DNA. Which of these feature(s) of DNA has/have been found useful in criminal investigations?

  1. 1 only

  2. 1 and 2

  3. 1 and 3

  4. 2 only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The chemical uniqueness of DNA (except in identical twins) makes it invaluable for criminal identification. Features 1 and 3 are correct - DNA contains genetic information, and no two individuals (except identical twins) have the same DNA composition. Feature 2 is incorrect because DNA composition CAN be found in other people - relatives share similar DNA patterns.

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