Biology Help Please

Hi, I would really appreciate some help with this question.

Hi,
The table shows that for Val the bases are GU (followed by a third)
Ala is GC
You can see this by following the sections on the table that these amino acids are found in.
The answer therefore GUU ->GCA I believe,

Hi sorry for the delay,
I really appreciate it, thank you.
I thought so but for some reason the mark scheme says CAA -> CGA?

Hi! This question seems familiar to me lol I believe I got stuck on it previously too. Not sure if you found the answer already but basically what you need to understand is that table 1 is showing the “mRNA” codons whilst the question is asking for the “DNA” mutation which would result in the change.
The correct answer is CAA —> CGA because this mutation in “DNA” would result in a GUU —> GCU codon in “mRNA” as in RNA guanine is complementary to cytosine and adenine is complementary to uracil. And from the table you can see how GUU mRNA codon codes for Val but then codes for Ala when it is GCU.
Hope this makes sense!!