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Location of the suppressor of meth _A17 mutation in the 30 mutant of Aspergillus nidulans

Tânia MA. Domingues Zucchi

Departamento de Ciências Morfológicas, Laboratório de Genética, Faculdade de Odontologia, USP, 14049 Ribeirão Preto. SP. Brasil

ABSTRACT

Mutant 30 was studied because of its peculiar meiotic and mitotic behavior. The high frequency of recombination in the meth-w interval of chromosome II is due to a silent and recessive meth Al7 suppressor. Mitotic analysis revealed strong selective pressure against chromosome I and VII. The morphology of the suppressed strain in a medium lacking methionine permitted the determination of the location of sup 30 in chromosome VII linked to the nic B8 locus (26.8%).

Keywords: Suppressor; Meth _A17 mutation; Aspergillus nidulans.

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