A Neurospora cross was made between a strain that carried the mating-type allele

Question

A Neurospora cross was made between a strain that carried the mating-type allele A and the mutant allele arg-1 and another strain that carried the mating-type allele a and the wild-type allele for arg-1 (+). Four hundred linear octads were isolated, and they fell into the seven classes given in the table below. (For simplicity, they are shown as tetrads.) In order, what are the arrangements of the tetrads?

Question 19 options:

PD, PD, NPD, NPD, TT, TT, TT

PD, NPD, PD, TT, TT, TT, NPD

PD, NPD, TT, TT, TT, TT, TT

PD, NPD, NPD, NPD, NPD, NPD, TT

PD, NPD, TT, TT, PD, NPD, TT

NPD, PD, TT, TT, PD, PD, TT

PD, PD, NPD, NPD, TT, TT, TT

PD, NPD, PD, TT, TT, TT, NPD

PD, NPD, TT, TT, TT, TT, TT

PD, NPD, NPD, NPD, NPD, NPD, TT

PD, NPD, TT, TT, PD, NPD, TT

NPD, PD, TT, TT, PD, PD, TT

Explanation / Answer

PD, NPD, NPD, NPD, NPD, NPD, TT

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