Question

A segment of DNA has a base sequence. ATG ACG GAC AGA AAC Which one of the following represents frame shift mutation. (1) GTC ATG AGA GAC AC (2) ATG CAG GGA CGA AC (3) ATG CGG ACA GAA AC (4) CAT GAC GAA CGA AC

Answer 1

3 is the answer
insertion or deletion of one or two bases changes the reading frame from point of insertion or deletion this is the frame shift mutation.
here A is deleted from the sequence