4. In the graph shown below, the dashed line shows the level of MRNA for a certain protein, Prot6, at various positions along the anterior-posterior axis of an insect embryo. The solid lines portray the levels o two regulatory proteins, A and B that control translation of the Prot6 mRNA. A B Position Biology: How Life Works, Second Edition © 2016 W.H. Freeman and Company If both A and B stimulate translation of the Prot6 mRNA, then which graph, from the ones shown below, best approximates the expected level of Prot6 across the embryo? Briefly justify your answer. M H K Position Position Position Position Position Protein level MRNA level

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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.