Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. to illustrate this process, consider a cell culture that contains 1 million bacterial cells that double every 20 minutes. a single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? (Before you go through the calculation, make a guess: do you think it would take about a day, a week, a month, or a year?) how many cells of either type are present in the culture at this time? (the number of cells N in the culture at time t is described by the equation N = N0 × 2t/G, where N0 is the number of cells at zero time and G is the generation time.)
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.
Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. to illustrate this process, consider a cell culture that contains 1 million bacterial cells that double every 20 minutes. a single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? (Before you go through the calculation, make a guess: do you think it would take about a day, a week, a month, or a year?) how many cells of either type are present in the culture at this time? (the number of cells N in the culture at time t is described by the equation N = N0 × 2t/G, where N0 is the number of cells at zero time and G is the generation time.)
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