Haemochromatosis is a recessive disorder caused by mutations in the HFE gene. The disorder can be the result of nonfunctional HFE protein, or from very low levels (expression) of the HFE protein. Below is a northern blot gel showing the amount and size of HFE mRNA for a person who does not have haemochromatosis (WT). The mRNA was loaded at the top of the gel. WT A B C D Position the bands on the gel shown in each question as directed. Part 1 Tom has a mutation which changes the sequence of an enhancer region adjacent to the TATAA box for this gene. Position Tom's band in Lane A. WT A B n D

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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.