The two alleles of the mating-type gene of Neurospora tetrasperma have been introgressed into a largely N. crassa genetic background. Under these circumstances, they are no longer able to coexist without inhibition in heterocaryons, nor can they do so with their opposite mating-type allele from N. crassa. Neither are they compatible with the latter in partial diploids heterozygous for the mating-type alleles. The implications of this are briefly discussed.
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Metzenberg et al. (1973) studied this question.
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