Auxins are plant hormones that coordinate several aspects of root growth and development. Indole-3-acetic acid (IAA) is an auxin that is usually synthesized from the amino acid tryptophan (see figure to the right). The Trp-T gene encodes an enzyme that converts tryptophan to indole-3-pyruvic acid (I3PA), which is then converted to IAA by an enzyme encoded by the gene YUC. Predict how the deletion of one base pair in the fourth codon of the Trp-T gene would most likely affect the production of IAA. Justify your prediction.