Polarized Segregation in Bombardia lunata

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Abstract
Data for the arrangement of ascospores in Bombardia collected by Zickler (1934) and analysed by Catcheside (1944) suggested the polarization of segregation of a single gene affecting spore colour. The conclusion has been re-examined from crosses between wild type and the rubiginosa mutant under conditions where the environment was controlled and precautions were taken to eliminate bias introduced by the observer. The same polarization was found to exist within the first-division segregation classes but to a lesser degree while the bias between the symmetric and asymmetric second-division classes is exactly reversed. Cytolo-gical observations indicate that the plane of the second division is not preserved in the ascus. It is concluded that the apparent polarization probably occurs after meiosis where segregation is normal.

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