1 00:00:00,210 --> 00:00:01,940 Now, hopefully you were able to breeze right through 2 00:00:01,940 --> 00:00:05,350 this if you had some slight understanding of these 3 00:00:05,350 --> 00:00:08,150 terms over here. Now, if we compare this first 4 00:00:08,150 --> 00:00:10,920 sequence to the original up here, we see the only 5 00:00:10,920 --> 00:00:14,450 difference is a one letter change right here. That 6 00:00:14,450 --> 00:00:17,150 means that this is going to be a single nucleotide 7 00:00:17,150 --> 00:00:21,330 chain. The second sequence actually looks the same as 8 00:00:21,330 --> 00:00:26,030 the original, except that it's missing a CA right here. 9 00:00:26,030 --> 00:00:28,460 So there's been a deletion. The next one 10 00:00:28,460 --> 00:00:32,420 has actually had an insertion added in for 11 00:00:32,420 --> 00:00:37,810 have been a number two. This fourth one. Notice there was a TAC and then it got 12 00:00:37,810 --> 00:00:40,520 repeated and repeated again. This is what we 13 00:00:40,520 --> 00:00:43,450 call a Trinucleotide repeat. We have three in 14 00:00:43,450 --> 00:00:51,180 a row. And in this last one turned out to be a complete duplication end to end. 15 00:00:51,180 --> 00:00:57,335 The sequence was just duplicated over. So would be number three.