Passage I
SLEEPLESS is a fruit fly gene involved in sleep regulation. The normal form of this gene (S+) produces sleep factor protein; a mutant form (S-) does not produce the protein.
Researchers studied the sleep patterns and survival of flies of the same age that had the genotype S+S+, S+S- or S-S- . Figure 1 shows the amount of sleep, and the number of sleep events, per day per fly for each genotype. Figure 2 shows the amount of recovery sleep (additional sleep needed following 6 hr of sleep deprivation) per day per fly for each genotype. Figure 3 shows how percent survival varied with age for each genotype.
3. Based on Figures 1 and 3, of the flies that had an average of 12 sleep events per day, the percent that reached 35 days of age was most likely closest to which of the following?
Your Answer is
Correct Answer is C
Explanation
From the second picture of figure 1, it can be seen that SS- has 12 sleep events, corresponding to figure 3, it can be seen that when the abscissa is 35 days, the ordinate percent survival of SS- corresponds to about 25%