UV Radiation 1.UV light causes chemical changes to bases…. HOW? This prevents DNA from replication properly 2.Prevent damaged DNA from passing on information.

Slides:



Advertisements
Similar presentations
DNA Replication Ask why, when, and where they think replication occurs? Ask them to recall when copies are needed?
Advertisements

DNA damage and repair Types of damage Direct reversal of damage Excision repair in prokaryotes and eukaryotes base excision nucleotide excision Nonhomologous.
Chapter 20 DNA Replication and Repair. Replication is bidirectional.
Chapter 9, Section 2 & 3 Regular Biology
DNA Structure and Replication Genetics DNA Can replicate Is the hereditary material Controls cellular activities by coding for and controlling protein.
Chapter 10 Notes Structure of DNA. DNA is Made up repeating units of nucleotides Three parts of a Nucleotide are: 1. Deoxyribose sugar 2. Phosphate group.
Structure of DNA. Nucleotides Know that DNA contained 4 different types of nucleotides Purines – 2 ring bases –Adenine –Guanine Pyrimidines – 1 ring base.
The Roles of Enzymes in DNA Replication By definition, DNA Replication is the process of making a copy of itself. In other words existing strands of DNA.
Genetics Chapter 20. Genetics  Study of HEREDITY  Traits that are passed from parent  offspring  Sexual Repro.  2 parents, offspring is a combo.
1 DNA Replication copyright cmassengale Vyi4.
8.5 DNA Repair At the end of S phase, DNA polymerase has copied both strands of template DNA DNA polymerase does make mistakes -1 mistake every 10,000.
Chapter 12.3 (Pgs: ): DNA Replication. The Replication Process 1.DNA separates into two strands -Accomplished by the enzyme helicase -Creates a.
DNA Replication Replication: The process before a cell divides, it duplicates and copies its DNA. DNA  DNA Remember: Each strand can be used to make.
The Fourth Macromolecule!!! Objectives: 1.Describe the structure and function of DNA and RNA 2.Explain how DNA replicates itself 3.Explain the purpose.
DNA Replication. Watch this video to see how DNA replication actually occurs. ch?v=hfZ8o9D1tushttp:// ch?v=hfZ8o9D1tus.
DNA Replication!.
DNA Structure and Function 12.1 Function and structure of DNA.
Replisome, PCR, and DNA Repair C483 Spring Which proteins are responsible for the unwinding of the double-stranded DNA during replication? A)
Biological Processes Objectives: 1.Explain how the cell makes energy 2.Explain how enzymes work 3.Review for Test.
Genetic Mutations Increasing Genetic Diversity May 4, 2010.
1 DNA and Replication. 2 Chargaff’s Rule Adenine ThymineAdenine must pair with Thymine Guanine CytosineGuanine must pair with Cytosine The bases form.
Do Now: In notebook: Fold down a page and start the next unit 2B. - Get colored pencils: - Red - Orange - Yellow - Green - Blue - Violet.
DNA Repair DNA repair is a system used to correct DNA damage caused by either: 1-Errors during DNA replication including incorrect base-pairing (mismatching)
DNA Repair DNA repair is a system used to correct DNA damage caused by either: A- Errors during DNA replication including incorrect base-pairing (mismatching.
DNA Replication - copying DNA molecule. Why does DNA need to copy? Every time a cell divides (mitosis), an EXACT copy of DNA must go into new cells! Growth.
Warm-up 12/2/15: Write the questions and the answers to the questions on a new warm-up sheet for the week. Where is DNA found in eukaryotic plant and animal.
Take out your homework. DNA WHY does G pair with C? What forces hold the base pairs together? What are the three functions of DNA? What does ‘antiparallel’
Section 1.3 Gases in the atmosphere absorb radiation.
MUTATIONS. Mutations Mutation: A change in the DNA sequence (gene), that also changes the protein it codes for. In Sex Cells: can produce new traits or.
DNA Replication.
11.1DNA Is Reproduced by Semiconservative Replication.
DNA: Structure and Replication DNA DNA. DNA is often called the blueprint of life. DNA contains the instructions for making proteins within the cell.
INTERACTIVE NOTES PGS CHROMOSOMES & DNA REPLICATION.
UV Light Damages DNA
 DNA replicates before a cell divides  Occurs during the S or synthesis phase of the cell cycle  Replication creates identical copies of DNA strands.
Chapter 12 DNA STRUCTURE AND REPLICATION. A. DNA Structure DNA is a nucleic acid composed of nucleotide monomers. DNA nucleotide consists of: F one phosphate.
1 2 DNA DNA.DNA is often called the blueprint of life. Enables cells to have different forms and functions.Enables cells to have different forms and.
Do Now  What is replication?  Where does this take place?
12.4 Mutations.  What is a mutation and where can it occur? Inheritable change in genetic code 99.9 % are harmful, only 0.1% are helpful  Any change.
Gene Regulation Ability of an organisms to control which genes are present in response to the environment.
Aim :How are the mistakes that occur during DNA replication repaired?
Gene mutation and sickle cell (k) explain the effect of the gene mutation resulting in sickle cell anaemia on the structure and oxygen transport efficiency.
DNA Replication pp
By: Samuel Shepler DNA Replication Model.
The Integumentary System
Structure and Role of DNA
copyright cmassengale
DNA Replication.
Homework: HP 6 answer reading questions
DNA Replication Notes Unit 5.
DNA Replication Created by Kim Useglia-former student teacher
copyright cmassengale
copyright cmassengale
1.The shape of a DNA strand is called?
copyright cmassengale
DNA Replication pp
Objective(s): I can define genes and describe their functions.
Lesson 3 Thursday, 11/14 AIM: What is a telomere?
DNA vs RNA DNA 1- Deoxyribose sugar
About how many cells are our bodies made of?
Reproduction and DNA Notes
Mutations.
Do Now What is replication? Where does this take place?
Gene mutation and sickle cell (k) explain the effect of the gene mutation resulting in sickle cell anaemia on the structure and oxygen transport efficiency.
Mutations.
DNA Replication.
DNA Replication Pre-AP Biology.
DNA Replication Chapter 12 Section 2
Mutations.
MI: Skin Cancer part II April 15, 2019
Presentation transcript:

UV Radiation 1.UV light causes chemical changes to bases…. HOW? This prevents DNA from replication properly 2.Prevent damaged DNA from passing on information. What ‘systems’? 3.Skin covers the entire body and is directly exposed to sun 4.Mutations in their DNA repair systems (passed down from parents) prevent repair

UV Radiation UV light contains more energy than white light DNA can absorb this energy What happens to electrons? Electrons ‘bounce around’

UV Radiation Thymine dimers What factors would determine how well you can get rid of these dimers = mutations?

Tautomers Bad things happen to Good Bases

What is deamination? deAMINation? What happens when cytosine get deaminated? What would the consequences be?

Deamination Cytosine

Deamination Cytosine just add water… and heat H2OH2O NH3

Deamination Cytosine

Deamination Cytosine Hmmm, this is ALMOST IDENTICAL to THIS Mutated Cytosine Thymine

DNA Mutations So, if all you need to mutate DNA is heat and water and/or oxygen… And you’re 50-60% water and pretty warm… Why isn’t your DNA mutated beyond recognition? Figure 12.7 ‘gives’ you the answer

Deamination Cytosine Mutated Cytosine Thymine

DNA Mutations What’s the real benefit to double-stranded DNA? The two strands PROTECT each other from water!!! Also, make it easy to copy and proofread!!!

DNA Replication Eukaryote vs Prokaryote Venn diagram comparing the two Include: Where it occurs, where it begins, how it proceeds/goes, form of the DNA, enzymes that puts new strands together, etc.

Homework Pages , 9-15, 18-24, Due MONDAY!

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.