Abstract
Females of the S1 line of Drosophila simulans, an isofemale line from a natural population at Mishima, Japan, were found to show high crossability to males of D. yakuba and D. teissieri. With D. yakuba males, 24.0-58.5% of the S1 females were inseminated, while the rate was only 0.0-6.3% for the control lines. The high crossability was ascribed to the genes on the X and third chromosomes. With D. teissieri males, 38.0-51.5% of the S1 females were inseminated, while the rate was only 0.0-6.2% for the control lines. The crossability was ascribed to the genes on the third chromosome, and possibly the second chromosome genes acted additively. The crossabilities of hybrid females between the S1 and the control lines were intermediate between the parental lines both to D. yakuba males and to D. teissieri males.
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