Chapter 12 DNA & RNA. Section 12 – 4 Mutations. Mutations. Key Concept : Gene mutations result from changes in a single gene. Chromosomal mutations involve changes in whole chromosomes. Gene Mutations. Point Mutations Affect one nucleotide Occur at a single point in the gene sequence
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Section 12 – 4Mutations
Key Concept:Gene mutations result from changes in a single gene. Chromosomal mutations involve changes in whole chromosomes
Insertions & Deletions
A nucleotide is added, or subtracted from the nucleotide sequence. This shifts the Codon grouping and drastically alters the amino acid sequence in the protein.
A single nucleotide is changed in the nucleotide sequence.