This pattern continues with geometric growth followed by a crash when the population exceeds the carrying capacity of 10. The number of generations varies with the class. More cooperative classes may exceed 25 generations in a 55 minute period. Difficult classes may only reach 10-12 generations. A student records the data on the board.
All students are responsible for copying the data and graphing it for homework.
Generation 3 then has 7 wild type and one mutant. I usually introduce mutants one at a time, during a generation that ensures reproduction. Deleterious mutations usually die out quickly. Eventually the 5 bean mutants will replace the wild type. This reduces the wild type generation by one.