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.
2. According to Figures 2, the amount of recovery sleep per day per fly for the S+S+ genotype was approximately how many times as great as that for the S+S- genotype ?
Your Answer is
Correct Answer is F
Explanation
From figure 2, it can be seen that the recovery sleep of S+S+ is 110 min, while that of S+S- is 60 min, so S+S+ is about twice that of S+S-