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Bridges Calvin B., Non-disjunction as proof of the chromosome theory of heredity. Genetics 1: 1-52, 1916

The chromosomes of the male have presented serious difficulties in spite of the very great amount of study devoted to them. Miss Stevens (1908 a) made a prolonged study involving the dissection and examination of some two thousand individuals. She described the three pairs of autosomes of the male as the same as those in the female, and the sex chromosomes as "a clearly unequal pair". [...]