with those of the later emerging ones.The averages for the two are approximately equal.A sample of five hundred individuals, 250 males and 250 females, taken from the general population of the mutant showed a range of variation in the number of facets from 45 to 182 with Pig. 1 A. Normal full eye of Drosophila.B. 'Bar' eye.The dark area8 are the faceted regions.
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Zeleny et al. (1915) studied this question.