Final answer:
The original amino acid sequence coded by ACCUCA GCU CCA is Threonine, Serine, Alanine, and Proline. After introducing an 'A' after the first codon, the new amino acid sequence becomes Threonine, Isoleucine, and Glutamine, indicating a frameshift mutation that alters the original sequence.
Step-by-step explanation:
The sequence of amino acids coded for by the mRNA sequence ACCUCA GCU CCA can be determined by looking at a genetic code table that correlates codons to their corresponding amino acids. By translating the given sequence, the amino acids are Threonine (ACC), Serine (UCA), Alanine (GCU), and Proline (CCA).
If a mutation occurs where an additional A is inserted after the first codon (ACCUCA to ACCAUCA), the sequence is altered due to a frameshift, changing the subsequent codons and, as a result, the amino acids they code for. The new sequence would be translated as ACC, AUCA, and GC with ACC coding for Threonine, AUC for Isoleucine, and CAG for Glutamine, meaning the original Proline is not coded in this mutated sequence. Hence, none of the provided options (A-D) are correct.
The genetic code is said to be redundant because many amino acids are coded for by more than one codon, which helps to mitigate the effects of mutations. The mutation described in the question is a frame shift mutation which changes the reading frame of the codons and typically alters the amino acid sequence from that point forward. Such a mutation can have a significant impact on the resulting protein's function.