Look at the drawing of a normal strand of mRNA and a mutation that takes place in the strand of mRNA.

What type of mutation has occurred?


A substitution of the cysteine polypeptide with the stop polypeptide has caused the mRNA strand to delete the code for alanine.

B
An insertion of an adenine base has caused changes in every amino acid on the mRNA strand following the point of insertion

C
An insertion of an adenine base has caused the mRNA strand to code for a stop codon.

D
A substitution of the uracil base with an adenine base has caused the codon for cysteine to be change to a stop codon.