Asked by Genetic Mutations
When DNA replication occurs before meiosis, the original DNA strand GTC ACA GGC ATC is copied into complementary strand CAG CCG TAG. What type of mutation has occurred??
Responses
A deletiondeletion
B insertioninsertion
C inversioninversion
D translocation
Responses
A deletiondeletion
B insertioninsertion
C inversioninversion
D translocation
Answers
Answered by
GPT-4o mini
To determine the type of mutation that has occurred based on the DNA sequence provided, let's analyze the original DNA strand and the complementary strand:
Original DNA strand:
**GTC ACA GGC ATC**
Complementary strand given:
**CAG CCG TAG**
To identify the mutation type, we should first calculate the complementary sequence of the original strand based on base pairing rules (A-T and C-G).
The expected complementary strand would be:
**CAG TGT CCG TAG**
Comparing the expected (CAG TGT CCG TAG) with the given complementary strand (CAG CCG TAG):
1. The first part (CAG) is correct.
2. The second part has changed: the expected “TGT” has been represented as “CCG” in the given complementary strand. This indicates that the sequence of bases has changed.
Analyzing the difference further, from the original strand:
- **Original:** GTC ACA GGC ATC
- **Expected Complementary:** CAG TGT CCG TAG
- **Given Complementary:** CAG CCG TAG
Here, in the second segment:
- Instead of "TGT" (which corresponds to the T at the 2nd position, G at the 3rd position, and T at the 4th position of the original), it turned into "CCG".
The mutation type inferred here involves a change in the nucleobases that likely suggests that a segment has been improperly altered.
With all this information, we can rule out most mutation types:
- **Deletion** (A): Loss of bases or segments.
- **Insertion** (B): Addition of one or more bases.
- **Translocation** (D): Movement of a DNA segment from one location to another non-homologous site.
The correct answer here regards a change in the sequence of nucleotides, which suggests they may have been inverted or otherwise altered in the middle portion of the strand, and thus fits **C: inversion**, where part of the sequence could be reversed or misplaced in some manner.
Answer: **C: inversion**
Original DNA strand:
**GTC ACA GGC ATC**
Complementary strand given:
**CAG CCG TAG**
To identify the mutation type, we should first calculate the complementary sequence of the original strand based on base pairing rules (A-T and C-G).
The expected complementary strand would be:
**CAG TGT CCG TAG**
Comparing the expected (CAG TGT CCG TAG) with the given complementary strand (CAG CCG TAG):
1. The first part (CAG) is correct.
2. The second part has changed: the expected “TGT” has been represented as “CCG” in the given complementary strand. This indicates that the sequence of bases has changed.
Analyzing the difference further, from the original strand:
- **Original:** GTC ACA GGC ATC
- **Expected Complementary:** CAG TGT CCG TAG
- **Given Complementary:** CAG CCG TAG
Here, in the second segment:
- Instead of "TGT" (which corresponds to the T at the 2nd position, G at the 3rd position, and T at the 4th position of the original), it turned into "CCG".
The mutation type inferred here involves a change in the nucleobases that likely suggests that a segment has been improperly altered.
With all this information, we can rule out most mutation types:
- **Deletion** (A): Loss of bases or segments.
- **Insertion** (B): Addition of one or more bases.
- **Translocation** (D): Movement of a DNA segment from one location to another non-homologous site.
The correct answer here regards a change in the sequence of nucleotides, which suggests they may have been inverted or otherwise altered in the middle portion of the strand, and thus fits **C: inversion**, where part of the sequence could be reversed or misplaced in some manner.
Answer: **C: inversion**
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