Repetitive sequences are useful for DNA fingerprinting because they
A) are not inherited and so are unique to every individual.
B) are unique to every individual and change from generation to generation.
C) are inherited and can show significant variability between individuals.
D) never undergo mutation.

Question

Repetitive sequences are useful for DNA fingerprinting because they
A) are not inherited and so are unique to every individual.
B) are unique to every individual and change from generation to generation.
C) are inherited and can show significant variability between individuals.
D) never undergo mutation.

Quizplus · Accepted Answer

Repetitive sequences are useful for DNA fingerprinting because they are inherited and can show significant variability between individuals. These repetitive sequences, also known as variable number tandem repeats (VNTRs), are longer stretches of DNA that contain multiple copies of a short repeating sequence. The number of repeats can vary between individuals, and these variations can be used to create a unique DNA profile for each individual. However, while VNTRs can show significant variability between individuals, they are also stable enough to be reliably detected and analyzed through DNA testing. In contrast, option A is incorrect because repetitive sequences are inherited and can be passed down from parents to offspring. Option B is also incorrect because while VNTRs are unique to every individual, they do not change from generation to generation. Option D is incorrect because all DNA sequences have the potential to undergo mutation, although the rate and types of mutations can vary.

Repetitive Sequences Are Useful for DNA Fingerprinting Because They