Fig. 4. Courting behavior of partially rescued Poxn males. The histogram at the top indicates the average number of recurved taste bristles per prothoracic leg (gray), the percentage of males initiating courtship under daylight (light blue) or red light (orange), and the percentage of copulating males under daylight (dark blue) and red light (red) within the observation period of 15 minutes (see Materials and Methods) for wild-type and partially or completely rescued Poxn males of the genotypes indicated below. The table at the bottom summarizes, as listed on the left, average latency times with standard deviations in parentheses, number of tested couples in single choice courting tests, and the rescue of phenotypic characters affected by the Poxn^M22-B5 mutation. Complete and partial rescue are indicated as + in dark-colored and as (+) in light-colored fields. The degree of male fertility is indicated by +++, ++ and + if more than 65%, 35-65% and 5-35% of single crosses result in offspring. In one case, male fertility is indicated as (-) because two out of 90 males produced a very low number of offspring (two and 20 larvae). The number of taste bristles on the male prothoracic leg is indicated with standard deviation in parenthesis, that of taste bristles on the anterior wing margin is given as percentage of the number observed in Oregon-R males.