[Campbell Biology P.486] According to the text, what is the approximate probability that two... | Practice Question

According to the text, what is the approximate probability that two non-identical people will have identical DNA profiles when 13 STR markers are used in forensic analysis?

  • A: Between one in 7 billion and one in 8 billion.
  • B: Between one in 10 billion and one in several trillion.
  • C: Less than one in a million.
  • D: Exactly one in a billion.

Explanation

The text states: "In forensic cases using STR analysis with 13 markers, the probability of two people having identical DNA profiles is somewhere between one in 10 billion and one in several trillion." Therefore, option B is the correct answer. Option A refers to the world's population, not the probability.