1.

A small stretch of DNA strand that codes for a polypeptide is shown below:3'--- --- --- --- CAT CAT AGA TGA AAC--- --- --- --- 5'(a)  Which type of mutation could have occurred in each type resulting in the following mistakes during replication of the above original sequence? (i)  3`… … … …CAT CAT AGA TGA ATC… … …5` (ii)  3`… … … …CAT ATA GAT GAA AC… … … 5`(b)  How many amino acids will be translated from each of the above strands (i) and (ii)?

Answer»

(a) i.  point mutation/ single base substitution

ii.  point mutation/ single base deletion

(b)  i.  4 aminoacids

ii.   4 aminoacids 



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