title: Lethal mutations and balanced lethal systems in Aspergillus nidulans.
mesh_terms: D000483:Alleles; D001230:Aspergillus; D002874:Chromosome Mapping; D003434:Crossing Over, Genetic; D004171:Diploidy; D005787:Gene Frequency; D005804:Genes, Lethal; D005808:Genes, Recessive; D006238:Haploidy; D006579:Heterozygote; D008540:Meiosis; D008938:Mitosis; D009154:Mutation / Q000528:radiation effects; D011830:Radiation Effects; D014466:Ultraviolet Rays