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Genetic mutations exercise

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Reference no: EM131922665

Genetic Mutations Exercise

Instructions: Below you are given an imaginary wildtype sense strand (coding strand) of DNA and the corresponding mature mRNA sequence with its corresponding protein sequence. Five mutant DNA sense strands are presented. For each mutant DNA strand (mutant 2-5), write the mRNA strand, the protein sequence, and an explanation of the type(s) of mutation represented, including the impact on protein synthesis. I have completed the first mutant as an example. I will post the answers after the assignment has been submitted. This is a required homework activity worth 5 points.

Wildtype sense strand sequence: ATG-TCA-CCC-GCG-CAG-GAA-GGA

(Upper case letters denote coding sequence of the DNA)

Mature mRNA sequence: AUG-UCA-CCC-GCG-CAG-GAA-GGA

Protein sequence: methionine-serine-proline-alanine-glutamine-glutamic acid-glycine

Mutant 1:                                                            ATG-TGA-CCC-GCG-CAG-GAA-GGA

mRNA:                                                                  AUG-UGA-CCC-GCG-CAG-GAA-GGA

Protein:                                                                 methionine-stop

Mutation:                                                            The fifth base is changed from a C to a G. This is a point mutation (and a base substitution). The mutation causes a nonsense mutation because a codon for serine is replaced by a stop codon, resulting in a truncated protein.

Mutant 2:                                                            ATG-TCA-ACC-GCG-CAG-GAA-GGA

mRNA:                                                                  AUG-UCA-ACC-GCG-CAG-GAA-GGA

Protein:                                                                 Methionine-Serine-Threonine-Alanine-Glutamine-Glutamic acid-Glycine

Mutation:                                                            

Mutant 3:                                                            ATG-CAT-TCA-CCC-GCG-CAG-GAA-GGA

mRNA:                                                                  AUG-CAT-UCA-CCC-GCG-CAG-GAA-GGA

Protein:                                                                 Methionine-

Mutation:

Reference no: EM131922665

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