
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.
map units, Recombination, Genetic, 570, Genotype, Genetic Linkage, Fungi, Mitosis, Spores, Fungal, Meiosis, Gene Frequency, centromere, Phycomyces, linkage, Alleles, Crosses, Genetic
map units, Recombination, Genetic, 570, Genotype, Genetic Linkage, Fungi, Mitosis, Spores, Fungal, Meiosis, Gene Frequency, centromere, Phycomyces, linkage, Alleles, Crosses, Genetic
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