A DNA segment removed from neurospora
(a pink mold) contained the base sequence
G-T-C-C-A-T-G-C-A. A similar segment of
DNA removed from neurospora that had been
exposed to radiation for several hours had the
base sequence G-T-C-C-A-T. This change in the
base sequence is an example of
(1) a deletion (3) a substitution
(2) an insertion (4) a replication