The chart matches messenger RNA codons with amino acids.

A DNA strand has the codon AAT. According to the chart, the corresponding messenger RNA codes for which amino acid?

The corresponding codon to AAT would be AAU, which would code for Asparagine. During mRNA coding, the tyrosine nucleotides transfer over to uracil, which gives the U in place of the T. Transfer RNA will then code for UUA, the complements to AAT.