Using the adenine–thymine base pair in this DNA sequence
...GCTC....

Question

Using the adenine–thymine base pair in this DNA sequence ...GCTC... ...CGAG... Give the sequence after a transversion mutation.

Accepted Answer

Hey, everyone. Let's take a look at this question together, identify the type of mutation in the following figure. And here we can see we have a figure that shows different sequences. And we want to determine what type of mutation is present in the figure. Is it answer choice. A transition mutation. Answer choice B A transversion mutation, answer choice C an insertion or answer choice D A deletion. So in order to solve this question, we have to compare the sequences to try to figure out if there are any changes to determine that type of mutation. And we are able to identify that in this first sequence, we have a thymine. Whereas in the second sequence in the same position, we have a guanine, which means that we have a change from that thymine to a guanine. And we note that thymine is a pyrimidine and guanine is a purine. So that means that the mutation that causes a change from the thymine to the guanine in the second sequence or a mutation that changes a pyrimidine to a pine is a transversion mutation. So that means that answer choice B transversion is the correct answer. Since a transversion is a mutation in which a pyrimidine or a purine is substituted with a different base. And in this case, we have a P A eddine being substituted for a pine, which is that thymine being substituted with that guanine. So we have a transversion mutation which is answer choice B the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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Using the adenine–thymine base pair in this DNA sequence ...GCTC... ...CGAG... Give the sequence after a transversion mutation.