Question

In gene tests for inherited colon cancer, scientists scan a patient's DNA sample for mutated sequences using short pieces of DNA, called probes. The sequences of the probes are complementary to the mutated sequences. What happens after a probe DNA is inserted into a patient’s genome?

A) The DNA probe repairs the mutated sequence.
B) The DNA probe binds to its mutated counterpart and destroys it.
C) The DNA probe binds to the mutated sequence and flags the mutation.
D) The DNA probe becomes an integrated part of the genome since it carries the complementary sequence to the mutated gene.
Elimin

Answer 1

C) The DNA probe binds to the mutated sequence and flags the mutation.

Step-by-step explanation:

The probe DNA carries the complementary base sequence to the inherited colon cancer gene (DNA). When inserted into the patients’ genome, the DNA probe binds to the mutated sequence and flags the mutation.

Answer 2

The answer is C) The DNA probe binds to the mutated sequence and flags the mutation.

The DNA probe is a sequence of DNA that is complementary to the mutated sequence. So, the DNA probe can bind to the mutated sequence. If the DNA probe binds to the complementary sequence in the patient's DNA, the patient has the mutated sequence in his DNA. Thus, DNA probe only serves to show if the mutation exists.