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Three main points are dealt with in the following account: 1) The relative frequency of sex linked lethal factors in inbred stocks of Drosophila ampelophila in comparison with their occurrence in wild stocks.2) The occurrence of new lethals and their linkage relations to other sex linked characters.3) The demonstration that an extraordinary sex ratio was due to the occurrence of two different lethal factors each carried by one of the sex chtomosomes of the female that gave the ratio in question.
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Mary B. Stark (1915) studied this question.
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