Section DNA: The Molecule of Heredity
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1 Ch 11: DNA and Genes - DNA: The Molecule of Heredity Inside This Section... What is DNA? The Structure of DNA DNA Replication What is DNA? Acid DNA is the blueprint of all living organisms. It controls how tall, what color, what sex, and every trait that the organism expresses
2 DNA & Protein DNA controls the organism through the production of Proteins in the form of are responsible for all functions of life. Walking, eating, blood clotting, thinking, and anything else that the organism does is affected by proteins Published an article detailing the of DNA structure with specific pairing. Photo: Marjorie McCarty The Structure of DNA DNA can hold a lot of information because they are. DNA is a polymer made of repeating subunits called. Nucleotides have three types of subunits: A Simple A Group A Base P Nitrogen Base Sugar Watson and Crick
3 The Sugar Group The sugar group found in DNA is The Phosphate Group The Phosphate group is composed of a atom surrounded by 4 atoms of O O P O O Nitrogen Base A carbon ring structure that contains one or more atoms of nitrogen. 4 types of bases in DNA
4 How do DNA Molecules Join? The phosphate group of DNA binds to the sugar group to form a for DNA Nitrogen Base P Sugar Sugar-Phosphate Backbone Nitrogen Base P Sugar All chromosomes are composed of the same substances regardless of their host organism. A toad has the same material as a bird. The of the nitrogen bases determines the organism s traits. A-T-T-C carries different information than A-A-A-T-C (Just like writing words). Replication of DNA All organisms must replicate DNA in order to survive. Every time a cell undergoes meiosis or mitosis, DNA must be The Order Spells it All!
5 Replication of DNA AATTTCGCCAAAT In Review... What is DNA? The Structure of DNA DNA Replication Ch 11: DNA and Genes - From DNA to Protein
6 Inside This Section... Genes and Proteins RNA and its functions Transcription Translation Genes and Proteins The of DNA information in the chromosomes is put into action through. Proteins are three-dimensional figures that perform a specific based on their. Proteins are used by organisms for structural support and as. Proteins are made of that are bonded by peptide bonds RNA RNA is also a acid (like DNA) There are 3 ways in which RNA differs from DNA RNA is stranded The sugar in RNA is instead of deoxyribose RNA has instead of thymine
7 Courtesy of: National Human Genome Research Institute (NHGRI) by artist Darryl Leja RNA There are three types of RNA RNA (mrna): brings messages from the DNA to the cytoplasm RNA (rrna): Helps ribosomes connect to mrna RNA (trna): Transports the amino acids to the ribosomes Transcription Transcription is a process that occurs in the of the cell. An enzyme called RNA polymerase makes an copy of a portion of DNA. That RNA strand is sent out to the cytoplasm as
8 RNA Polymerase The Genetic Code There are only different bases on which to base the entire genetic language. The combination of these bases determines the that it codes for. Genetic words are called and they are spelled by three bases (genetic letters). There are 64 possible codons that can be spelled by the bases. Codons are coded for either an amino acid OR a special function, like and. More Words than Needed There are only 20 amino acids and 64 genetic codes for those amino acids. That means that some amino acids have more than one. You will need to know the stop and start codons found on page 298 in your book.
9 Translation Translation is a process of turning the genetic message of mrna into a. (You translate it from a nucleic acid language to a protein language). Translation takes place at the in the cytoplasm The Role of trna In order for amino acids to be bonded, trna must bring the amino acids to the. There is only one trna for each. T
10 STOP T T In Review... Genes and Proteins RNA and its functions Transcription Translation Ch 11: DNA and Genes - Mutations
11 Inside This Section... What are mutations? The Types of Mutations DNA Repair Any change in the sequence If they are in any part of the body (other than gametes), they aren t passed on to the next. In some rare cases, a gene mutation may have positive effects. An organism may receive a mutation that makes it faster or stronger; such a mutation may help an organism - and its offspring - better survive in its environment. Biology, the Dynamics of Life pg. 303 What are Mutations?
12 Mutation Facts It s estimated that over 99% of mutations are harmful and over 90% are to the organisms which contain them. Mutational changes have definite which they can not transgress Radiation may cause damage to a that impairs its function. When the mutated cells go through mitosis, the mutated code is passed on Mutations in Non-Reproductive Cells Many Scientists believe that the build up of these mutations is the cause of. If the mutation takes place in the genes that control the cell cycle, it can result in Mutations in Non-Reproductive Cells
13 Types of Mutations Mutations Mutations Mutations A Point mutation is a change in a nitrogen base pair of DNA. This may or may not result in a change in a protein by one. Changing one amino acid can change the structure and function of the. Consider the following sentences: THE DOG BIT THE CAT THE DOG BIT THE CAR Frameshift Mutations A Frameshift mutation is when a single base is or to a DNA strand. This causes a in the genetic code and can result in a significant change in the mrna during the process of transcription. These are worse than Point Mutations because Point mutations only affect one amino acid Consider the following example THE DOG BIT THE CAT THE DOB ITT HEC AT Point Mutations
14 Chromosomal Mutations These are mutations that occur at the instead of at the level of the genetic code. Sometimes parts of chromosomes during mitosis and then rejoin incorrectly THE DOG BIT THE CAT THE DOB ITT HEC AT 4 Types: : When a part of the chromosomes is left out (deleted). : When a part of a chromatid breaks off and attaches to its sister chromatid (inserted). : When part of the chromosome breaks off and is reinserted backwards (inverted). : When part of the chromosome breaks off and is added to a different chromosome (translocated). Causes of mutations Some mutations seem to happen, perhaps as a mistake in base pairing during DNA replication. These are said to be. Some mutations are caused by factors in the environment. are the factors in the environment that cause mutations. Examples: Chemicals (asbestos, benzene, cyanide, etc) High Energy Chromosomal Mutations
15 Repairing DNA Cells have enzymes that the genetic code and correct the mistakes that are found. The greater the exposure of the enzymes to a, the more likely is the chance that a mistake will be made. In Review... What are mutations? The Types of Mutations DNA Repair
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