In Neurospora, the a locus is 5 mu from the centromere on chromosome 1. The b locus is 10 mu from the centromere on chromosome 7. From the cross of a b+ (x) a+ b, determine the frequencies of the following: (a) parental ditype asci, (b) nonparental ditype asci, (c) tetratype asci. (d) recombinant ascospores, (e) wild-type ascospores.