突变的两种方式 (b) Insertion (c) Deletion GGG AGT GTT AGA TCG GGG AGT GAG ATC GTC An insertion or a deletion alters the reading frame and may change many codons Three basic types of gene mutations are base substitutions. insertions. and deletions A Genetics ch128Genetics Ch12.8 一、突变的两种方式 • Three basic types of gene mutations are base substitutions, insertions, and deletions