GENETIC VARIATION OF THE HYBRID CROSSABILITY BETWEEN <i>DROSOPHILA MELANOGASTER</i> AND <i>D. SIMULANS</i>

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1.The genetic variation of the hybrid crossability between Drosophila melanogaster females and D. simulans males was examined by using eight geographical strains of D. simulans from Japan.<br>2. The hybridization was measured by insemination rate, egg to adult viability, and the number of hybrid progeny. The most experiments were undertaken with Oregon-R melanogaster females and various simulans male strains. The variation among simulans strains was clearly detected in these measurements and they were in large part positively correlated with each other.<br>3.The temperature sensitivity of the hybrid varied from strain to strain of simulans, and was not ascribed to the geographical origin of the strain.<br>4. D. melanogaster females were also variable in the hybrid crossability. Six melanogaster strains were significantly different in the insemination rate. A significant variance due to the interaction between melanogaster×simulans was also detected.<br>5. The yellow mutant of melanogaster females showed an excellent receptivity to simulans males, and the yellow locus itself seemed to respond it.

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