A part of an mRNA has the sequence AGA. Use the table below to figure out which amino acid is coded for by AGA, then use the table to figure out which
change to this sequence would indicate a silent mutation.
Messenger
Second base in codon
RNA Codons U
С
А
G
UUU UCU UAU UGU
Phe
UUC. UCC
UAC) Tyr UGC) Cys
Ser
UUA UCA UAA Stop UGA Stop A
Leu
UUG UCG UAG Stopi (UGG Trp
CUU CCU CAUT CGU
His
CUC |ССС CAC) CGC
Leu
Pro
Arg
CUA CCA CAA
Gin
CGA
CUG CCG CAG CGG
AUU ACU AAU AGU
Asn
Ser
AUC
lle ACC
AGC)
с
Thr
AUA ACA AAA
Lys
Arg
AUGStart Me ACG
AGG
GUU GCU GAU GGU
Asp
GUC
GCC GAC GGC
G
Val
Ala
Gly
GUA GCA
GGA
GUG GCG
GAG
GGG
First base in codon
Bo
Third base in codon
AAC)
AGA
AAG
GAA Glu
no

answer; /// the correct )

the answer to your question is b

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

this is a good question! i'll do some research and come back when i have the answer!