Compare DNA transposons and retrotransposons. What properties do they share?

Video transcript

Hi everyone. Let's look at our next question. It says which transpose herbal elements employ a copy and paste mechanism. Let's recall from our content video what transportable elements are. So transportable elements are nucleic acid segments that can change their position in the genome. Um It's obviously caused big changes. It can introduce mutations um Change the size of the genome. All sorts of things as you move stuff around duplicate genes. Um But they actually make up a large fraction of the genome and there are two types of these transpose transposing elements. We've got Class one or retro transpose eons and Class two or D. N. A. Transpose sins. So retro transpose actually have to be their D. N. A segment. It gets transcribed into RNA and then it gets reverse transcribed back into DNA. And then that D. N. A. Safe segment has moved. Cut and paste it into its new place. Whereas Class two or D. N. A. Transpose sins. They're already DNA. They stay as D. N. A. And just get cut out and then paste it into the new location. So these could be described as copy and paste since you first make an R. N. A copy of the element that's going to be moved. Whereas the D. N. A. Transpose ins can be described as cut and paste since you don't make a new copy you just cut out the D. N. A segment. Pop it into its new location. So our question is asking us which of these elements employ a copy and paste mechanism. So let's look at our answer choices noting that D. N. E. Have choice D. Is both A. And C. Choices both B and C. So we have the possibility of more than one correct answer. So choice A. Says D. N. A. Transpose eons. However as we saw the D. N. A. Transpose ons don't make a copy. They just start direct cut and paste. So that's not a correct answer. Choice B. Is retro transpose ions and they do employ that copy and paste copied into RNA, then reverse transcribed back into DNA and then moved so that is correct. Um But we can go ahead and eliminate um. Choice E. Which is both being I'm sorry choice D. Which is both A. And C. Since that doesn't include our correct answer and choice B. Then we look at choice C. Choice C. Says class one transpose herbal elements. While we see in our description below that class one is just another name for retro transpose sins. So that is therefore correct. So we see that our correct answer here would be then Choice E. Both B and C. See you in the next video