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Published October 1975 | Published
Journal Article Open

Meiosis in Phycomyces


A four-factor cross between two strains of Phycomyces involving two auxotrophic, one color, and the mating type marker is described. Samples of 40 germspores from 84 individual fertile germsporangia were characterized. The results show: (i) The germspores of a germsporangium are derived from one meiosis in approximately 78% of the cases. (ii) The four markers are on separate chromosomes. They are nonselective. (iii) Analysis of a large sample of germspores from 106 pooled germsporangia confirms that the four markers are unlinked. (iv) From the ditype/tetratype ratios it is inferred that each marker is located about 15 map units from its centromere.

Additional Information

© 1975 by the National Academy of Sciences Contributed by M. Delbrück, July 28, 1975 We thank E. D. Lipson, J. Reissig, and E. Cerda-Olmedo for helpful discussions, and Jeannette Navest and Doris Tsongas for technical assistance. A.P.E. was supported by a fellowship of The Commission for Educational Exchange between Spain and the U.S.A. The research was supported by N.S.F. Grant no. BMS 75-11316.

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August 22, 2023
October 23, 2023