Biology 8th Edition by Kenneth Mason ,Jonathan Losos,Susan Singer,Peter Raven,George Johnson

Exercise 4

Refer to figure 21.5, artificial selection in the laboratory. In this experiment, one population of Drosophila was selected for low numbers of bristles and the other for high numbers. Note that not only did the means of the populations change greatly in 35 generations, but also all individuals in both experimental populations lie outside the range of the initial population. What would the result of this experiment have been if only flies with high numbers of bristles were allowed to breed
Figure 21.5 Artificial selection can lead to rapid and substantial evolutionary change.