Two circular DNA molecules, which we can call molecule A andmolecule B, are topoisomers of each other. When viewed under theelectron microscope, molecule A appears more compact than molecule B. The level of gene transcription is much lower for molecule A. Which of the following three possibilities could accountfor these observations?First possibility: Molecule A has three positive supercoils, andmolecule B has three negative supercoils.Second possibility: Molecule A has four positive supercoils, andmolecule B has one negative supercoil.Third possibility: Molecule A has zero supercoils, and molecule Bhas three negative supercoils.
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.
Two circular DNA molecules, which we can call molecule A and
molecule B, are topoisomers of each other. When viewed under the
electron microscope, molecule A appears more compact than molecule B. The level of gene transcription is much lower for molecule A. Which of the following three possibilities could account
for these observations?
First possibility: Molecule A has three positive supercoils, and
molecule B has three negative supercoils.
Second possibility: Molecule A has four positive supercoils, and
molecule B has one negative supercoil.
Third possibility: Molecule A has zero supercoils, and molecule B
has three negative supercoils.
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