December 1991 LSAT Section 2 Question 23

"DNA fingerprinting" is a recently introduced biochemical procedure that uses a pattern derived from a person's genet...

MasonDees on September 8, 2022

Why is C correct?

Isn't it obvious that some people groups have some genetic material in common? How would stating something so obvious harm the proponents of DNA fingerprinting?

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Emil-Kunkin on November 28, 2022

Hi, let's say that 1 million people all have the same genetic marker. If the fingerprint looks for this marker, the results are no longer unique, like a fingerprint. Rather, they are looking at only one part of the fingerprint that may be shared by millions of people. This would not be a random error, which the passage tells us would not be an issue, but rather one caused by the fact that the thing we are treating as unique is not actually unique.