Visualizations of this quantity can range from simple “Fujiyama” to more complicated “badlands” representations. Stuart Kauffman devised his two-parameter NK model to allow visualizations (10[1])of this quantity to be “tunably rugged” depending on the degree of epistasis. This quantity is plotted on the y-axis of Sewall Wright’s namesake landscapes. (10[1])According to Kimura’s neutral (10[1])theory, most (10[1]-5[1])genetic variation does (10[1])not affect (10[1])this quantity, which (-5[1])is often denoted w. Fisherian (-5[1])runaway explains (10[1])the (10[1])presence of ostentatious traits as demonstrating a high level of this quantity. W. D. Hamilton proposed an “inclusive” (-5[1])form of this quantity that increases in kin selection, (10[1])which helps explain altruistic behavior. For 10 points, (10[1])name this quantity that measures an organism’s reproductive (10[1])success. (10[1])■END■ (10[2])