1 / 12

Chapter 12 DNA & RNA

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

eudora
Download Presentation

Chapter 12 DNA & RNA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 12DNA & RNA Section 12 – 4Mutations

  2. Mutations Key Concept:Gene mutations result from changes in a single gene. Chromosomal mutations involve changes in whole chromosomes

  3. Gene Mutations • Point Mutations • Affect one nucleotide • Occur at a single point in the gene sequence • Three Types: • Deletion • Insertion • Substitution

  4. Point Mutations Frameshift Mutations Result From 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.

  5. Point Mutations Substitution A single nucleotide is changed in the nucleotide sequence. • This may result in a change to a single amino acid in the protein. • The change to a single amino acid may or may not alter the proteins function.

  6. Point Mutations - Substitution

  7. Chromosomal Mutations • Changes the number or structure of chromosomes • May change locations of genes on chromosome or the number of copies of some genes

  8. Chromosomal Mutations 4 Types • Deletion • Duplication • Inversion • Translocation

  9. Deletion X • Deletion • Loss of all or part of a chromosome

  10. Duplication • Duplication • Segment of chromosome is repeated

  11. Inversion • Inversion • Chromosome or part of a chromosome is oriented in the reverse direction

  12. Translocation • Translocation • Part of one chromosome breaks off and attaches to another, • nonhomologous chromosome

More Related