FIGURE 12-24 Mutations were used to identify genes that suppress, Su(var), or enhance, Eſvar), position-effect variegation. Some gene products enhance or suppress the spread of heterochromatin Second-site mutations that affect the spreading of heterochromatin Drosophila eye (translocated white*) E(var) Spreading enhanced. More white are silenced. Spreading suppressed. Fewer white are silenced. Su(var)
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.
. Let’s say that you have incredible skill and can isolate the
white and red patches of tissue from the Drosophila eyes
shown in Figure 12-24 in order to isolate mRNA from
each tissue preparation. Using your knowledge of DNA
techniques from Chapter 10, design an experiment that
would allow you to determine whether RNA is transcribed from the white gene in the red tissue or the whitetissue or both. If you need it, you have access to radioactive white-gene DNA
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