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K   V          T







           allele                                                  DNA                              nucleus
           different forms of a gene                               deoxyribonucleic
                                                                   acid; genetic                     DNA

               alleles     A B c D     e   F G h i     J           material within
                alleles
                                                                   the nucleus
                           a b C d     E   f  g H I    j



                                                                                                     gene
           amino acids                                             gene
           building blocks          amino acid chain               the sequence
           of protein                                              of DNA that
           molecules                                               codes for a
                                                                   specific trait
                                                                                                           protein




                                                                                            The Gentic Code Table
                                                                                             2
           anticodon                                               genetic code             U   The Genetic Code  G
                                                                                                        A
                                                                                                  C
           a triplet of nitrogen                                   the correspondence  1  U  Phenylalanine  Serine  Tyrosine  Cysteine  U C A  3
                                                                                          Phenylalanine
                                                                                                      Tyrosine
                                                                                                            Cysteine
                                                                                                Serine
                                                                                          Leucine
                                                                                                            Stop
                                                                                                Serine
                                                                                                      Stop
           bases on transfer RNA                                   between RNA            Leucine  Serine  Stop  Tryptophan  G U
                                                                                                Proline
                                                                                                      Histidine
                                                                                                            Arginine
                                                                                          Leucine
           that is complementary       tRNA                        triplets and specific   C  Leucine  Proline  Histidine  Arginine  C A G
                                                                                          Leucine
                                                                                                            Arginine
                                                                                                      Glutamine
                                                                                                Proline
                                                                                                            Arginine
                                                                                          Leucine
                                                                                                      Glutamine
                                                                                                Proline
           to a codon on                                           amino acids that     A  Isoleucine  Threonine  Asparagine  Serine  U C
                                                                                          Isoleucine
                                                                                                      Asparagine
                                                                                                Threonine
                                                                                                            Serine
           messenger RNA                                           are used to form a     Isoleucine  Threonine  Lysine  Arginine  A G
                                                                                                      Lysine
                                                                                                            Arginine
                                                                                          Methionine
                                                                                                Threonine
                                                                                          Valine  Alanine  Aspartic acid  Glycine  U
                                                                   particular protein   G  Valine  Alanine  Aspartic acid  Glycine  C A
                                                                                                Alanine
                                                                                          Valine
                                                                                                      Glutamic acid
                                                                                                            Glycine
                                            anticodon                                     Valine  Alanine  Glutamic acid  Glycine  G
                                                                                       U U C
           chromosome                                              mRNA                          nucleus
           a structure of coiled                                   messenger
           DNA that forms in                                       ribonucleic acid;
           the cell’s nucleus                                      carries a code for
           prior to mitosis                                        producing proteins
                                                                   in the cell
                                                                                                         mRNA
                                                 amino acid                                             A  G  A  T  T
           codon                                                   mutation                T        DNA  T  C  T  A  A
                                                                                           M
           sequence of three                                       a change that                substitution  a base pair is changed
           nucleotides on            tRNA                          takes place     A  G  C  T  T         A  G  T  T
           messenger RNA                                           on a gene or a   T  C  G  A  A  deletion  T  C  A  A
           that code for the                                       chromosome     original DNA sequence  addition  a base pair is removed
           production of a                        mRNA                                                  A  G  C  C  T  T
           specific amino acid                                                                          T  C  G  G  A  A
                                           codon                                                        a base pair is added
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