Abstract
An investigation of nondisjunction inDrosophila hydei has disclosed that spontaneous primary nondisjunction of the X chromosomes occurs with a frequency of 1/13000, and secondary nondisjunction with a frequency of 1/3500. These rates are much lower than the ones previously reported forDrosophila melanogaster which are about 1/1000 for primary nondisjunction and 1/50 for secondary nondisjunction.
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