MemberMay 13, 2021 at 11:03 am0 Replies6570 XPContributions: EnterMedSchool DonorForum Rank: Forum NewbieReputation: Level 3
Hello, as you know, the answer is A, so look at P and Q, you’ll see the different base pair starting from 8th base pair (G-A).
– If it is addtion type: in Q, it must be …GGGAT or GGAGT but it is GGAT => deletion type.
– Because it is deletion type, so the nucleotide subsequence after 8th base pair are pushed forward, but you can see that the length of P and Q are the same => there is also addition type.
– Then, you can see in 11th and 13th base of Q are different from P (after …ATT in P is CCCT whilst in Q is GCAT)
+ 11th base of Q is substitution (substition is replaced by a base of the same kind: G, C)
* If 11th base of Q is addtion => it must be GCCT (!!!)
+ 13th base of Q is addtion as we mentioned above, and also there is ONLY ONE addtion type in Q (if there are two => the length of two is not the same)