Use the following table to help you respond to the prompts below.


Codons Found in Messenger RNA
Second Base
First Base U C A G Third Base
U Phe
Phe
Leu
Leu Ser
Ser
Ser
Ser Tyr
Tyr
Stop
Stop Cys
Cys
Stop
Trp U
C
A
G
C Leu
Leu
Leu
Leu Pro
Pro
Pro
Pro His
His
Gln
Gln Arg
Arg
Arg
Arg U
C
A
G
A Ile
Ile
Ile
Met(Start) Thr
Thr
Thr
Thr Asn
Asn
Lys
Lys Ser
Ser
Arg
Arg U
C
A
G
G Val
Val
Val
Val Ala
Ala
Ala
Ala Asp
Asp
Glu
Glu Gly
Gly
Gly
Gly U
C
A
G


During DNA replication, a mistake occurs in which a single letter is replaced with a different one. This is called a substitution mutation and can occur in many genetic diseases such as cystic fibrosis. Instead of the nitrogenous bases ATG, the DNA now codes for ATT.

Part 1: Identify the sequence of complementary mRNA nucleotides for the original DNA, ATG, and the mutated DNA, ATT.

Part 2: Use the codon table above to determine if this mutation in the DNA code will cause a change in the amino acid. Explain your reasoning.