The common fruit fly, Drosophila melanogaster, is the most studied organism in genetic research because it is small, easy to grow, and reproduces rapidly. The length of the thorax (where the wings and legs attach) in a population of male fruit flies is approximately Normal, with mean 0.800 millimeter (mm) and standard deviation 0.078 mm. Exercises 11.22 to 11.24 use this information.   11.23 Approximately 16% of male fruit flies have thorax length shorter than 0.644 mm.

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