Here is the model for TfR mRNA regulation (see Fig.), for your convenience. Orange protein (IRP or IREBP), when bound to RNA, protects mRNA from degradation. When Fe is bound to the protein, it cannot bind the mRNA. If you made a radioactive DNA probe specific to TfR mRNA and performed a Northern blot analysis (to detect mRNA) from cells treated with high iron (Fe) concentration what would you expect to see? (a) Low iron Degradation O The result would be the same as untreated cells O High levels of RNase O Low levels of TfR mRNA O High levels of IRP (or IREBP - iron responsive element binding protein) O High levels of TfR mRNA

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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.