Enhanced crossing over in the second chromosome of <I>Drosophila ananassae</I>
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概要
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Descriptions of enhanced crossing over in the second chromosome of <I>Drosophila ananassae</I> are given here, as a continuation of the writer's previous papers (Moriwaki 1937a, 1937b).<BR>1. The locus of Minute-In (<I>M-IIb</I>), which was believed to be situated near the left end of the second chromosome and also to be related with the enhancing power of crossing over, was, on the contrary, found to be in the right arm.<BR>2. Concerning the relation between <I>M-IIb</I> and the enhancing power, it is concluded that this power cannot possibly be derived from <I>M-IIb</I> itself, but that it must be independent, and further, that the enhancer may be regarded as a dominant gene, Enhancer-II (<I>En-II</I>), probably belonging to the right arm similar to <I>M-IIb</I>.<BR>3. It must be true that the enhancer ought to be able not only to increase somewhat the female crossing over, but also to induce male crossing over.<BR>4. While it is remarkable that, except <I>M-IIb</I> and <I>En-II</I>, all the mutants (about 20) found in the second chromosome belong to the left arm, we cannot, judging from the figures of the salivary gland cells, say that the right arm is almost inactive. The interpretation that the mutability of genes in that arm is quite low, is preferable.
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