gene expression

Question 1

what occurs if you change the nucleotides at the first and second position of a codon?

Answer 1

this changes the amino acid

Question 2

what occurs if you change the third nucleotide in a codon ?

Answer 2

this does not normally change the amino acid encoded

Question 3

if there is a mutation at the 3rd position of a nucleotide will this cause a change in the protein ?

Answer 3

not normally