1 Genetic code is specific. 2 A specific codon always codes for the same amino acid.
Superimpose code. The genetic code by which DNA stores the genetic information consists of codons of three nucleotides. The functional segments of DNA which code for the transfer of genetic information are called genes. With four possible bases, the three nucleotides can give 4 3 = 64 different possibilities, and these combinations are used to specify the 20 different amino acids used by living organisms. The bases occur in the complementary base pairs A-T and G-C, but along the sequence on one side the bases can occur in any order, like the letters of a language used to compose words and sentences. To further illustrate what is meant by a true code, consider the magnetic letters fixed to the magnetic board at right. A series of codons in part of a messenger RNA (mRNA) molecule. Each codon consists of three nucleotides, usually corresponding to a single amino acid. The nucleotides are abbreviated with the letters A, U, G and C. This is mRNA, which uses U (uracil). DNA uses T (thymine) instead. The genetic code is the set of rules by which information encoded within genetic material (DNA or mRNA sequences) is translated into proteins by living cells. Characteristics are passed on from one generation to another within a species through the genetic code of the parents. This genetic code is called DNA. DNA The blueprint that is passed on from the parents to the offspring is found in a molecule of the cell nuclei. This molecule, desoxyribonucleic acid, (DNA) is the inherited material responsible for variation. The arrangement of these four chemicals creates the code that the cells are able to interpret. This is the genetic code of the organism. Chromosomes DNA contains all the instructions which create the organism's characteristics. The genetic code is made up of four nitrogen bases, adenine, thymine, cytosine, and guanine. The order of these four bases makes up the code. Adenine only pairs with thymine and cytosine only pairs with guanine. This is called DNA. DNA is loosely attached to double strands of chromosomes. This is called the Double Helix. The genetic code is a three-letter (triplet) code defining the transfer of the information from nucleic acids to proteins. Codon is a successive string of three nucleotides. Nucleotides found in human DNA are adenine (A) , guanine (G) , thymine (T) and cytosine (C) . In RNA one of them-thymine-is replaced by uracil (U) . According to the order of codons in the mRNA, the individual aminoacids are inserted into nascent polypeptide chain.  Genetic code. 1  Genetic code is a dictionary that corresponds with sequence of nucleotides and sequence of Amino Acids.  2  Words in dictionary are in the form of codons.  3  Each codon is a triplet of nucleotides.  4  64 codons in total and three out of these are Non Sense codons (Figure-1).  5  61 codons for 20 amino acids. 5) Non Sense Codons.  1 There are 3 codons out of 64 in genetic code which do not encode for any Amino Acid.  2 These are called termination codons or stop codons or nonsense codons. 3  The stop codons are UAA, UAG, and UGA. 4  They encode no amino acid. The sequence of bases in DNA operates as a true code in that it contains the information necessary to build a protein expressed in a four-letter alphabet of bases which is transcribed to mRNA and then translated to the twenty-amino-acid alphabet necessary to build the protein. The bases occur in the complementary base pairs A-T and G-C, but along the sequence on one side the bases can occur in any order, like the letters of a language used to compose words and sentences. To further illustrate what is meant by a true code, consider the magnetic letters fixed to the magnetic board at right. Figure-1- Genetic code is a dictionary that corresponds with sequence of nucleotides and sequence of Amino Acids. Genetic Code-Characteristics (Table-1). 1) Specificity. 1  Genetic code is specific (Unambiguous).  2  A specific codon always codes for the same amino acid. 5) Non Sense Codons.  1 There are 3 codons out of 64 in genetic code which do not encode for any Amino Acid.  2 These are called termination codons or stop codons or nonsense codons. 3  The stop codons are UAA, UAG, and UGA. 4  They encode no All living organisms contain DNA in their cells. DNA and the Genetic Code DNA was discovered prior to 1944. All DNA molecules contain exactly the same chemicals, but the way the chemicals combine determines the characteristics of the organism. The arrangement of these four chemicals creates the code that the cells are able to interpret. This is the genetic code of the organism. Chromosomes DNA contains all the instructions which create the organism's characteristics. Some number of nucleotides in mRNA must code for the incorporation of a single amino acid into a protein. The rules that relate the mRNA base sequence to amino acid base sequence are called genetic code. Definition: Genetic code is the nucleotide base sequence on DNA (and subsequently on mRNA by transcription) which will be translated into a sequence of amino acids of the protein to be synthesized. 
http://hyperphysics.phy-astr.gsu.edu/hbase/organic/gencode.html https://en.wikipedia.org/wiki/Genetic_code http://www.edquest.ca/component/content/article/130 https://answers.yahoo.com/question/index?qid=20120819005125AANT4NL http://www.wikilectures.eu/index.php/Genetic_Code http://www.namrata.co/genetic-code-and-its-characteristics/ http://hyperphysics.phy-astr.gsu.edu/hbase/organic/gencode.html http://www.namrata.co/genetic-code-and-its-characteristics/ http://www.edquest.ca/component/content/article/130 http://www.biologyexams4u.com/2013/03/genetic-code-definition-characteristics.html
what characteristics of dna creates the genetic code