Karenca was studying her genetics notes the night before the test. She was getting a little turned around with the differences between DNA and RNA. She started working a problem that gave a segment of original DNA as follows: ТА Then, the problem said that original DNA was mutated to become: TAG Use the codon table to help Karenca determine whether or not this mutation will cause a change in the phenotype (what the organism looks like) of the organism. Even though the DNA sequence changed, the sequence still codes for the same amino acid, so no change in phenotype will occur. Yes, the phenotype of the organism would change because a new amino acid will be coded for. Yes, the phenotype of the organism would change because any change in the DNA sequence will cause a change in phenotype. It is impossible to determine if a change in phenotype will occur using only the DNA sequence.
Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.



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