Abstract
In Drosophila melanogaster when a white-eyed, long-winged female is crossed with an eosin-eyed, miniature-winged male, the daughters are all heterozygous and may be represented by the formula , indicating that one of the × chromosomes carries the determiners for white eye-color (w) and long wings (M) while the other carries the determiners for eosin eye-color (We) and miniature wings (m). If such a heterozygous female is bred she will have four kinds of regular sons irrespective of the male with which she is crossed, since the regular sons obtain their × chromosomes from their mother only. In two of the kinds of sons the characters will appear as they entered in the original cross, i. e., one kind will be white-eyed and long-winged and the other eosin-eyed and miniature-winged; these make up the noncrossover classes. In the other two kinds of sons the characters will be interchanged, i. e., one kind will be white-eyed and miniature-winged and the other eosin-eyed and long-winged; these make up the crossov...
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