Barrier insulators stop the spread of heterochromatin HР-1 HMȚase HAT FIGURE 12-26 In this model, barier insulators recruit enzymatic activities such as histone acetyltransferase (HAT) that promote euchromatin formation. The letter "M" stands for methylation, and the letter "A" for acetylation. Heterochromatin Euchromatin Barrier insulator
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.
In Figure 12-26, provide a biochemical mechanism for
why HP-1 can bind to the DNA only on the left side of the
barrier insulator. Similarly, why can HMTase bind only
to the DNA on the left of the barrier insulator?
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