The pathway for arginine biosynthesis in Neurosporacrassa involves several enzymes that produce a seriesof intermediates.ARG-E ARG-F ARG-G ARG-HN-acetylornithine → ornithine → citrulline → argininosuccinate → argininea. If you did a cross between ARG-E− and ARG-H−Neurospora strains, what would be the distributionof Arg+ and Arg− spores within parental ditype andnonparental ditype asci? Give the spore types inthe order in which they would appear in the ascus.b. For each of the spores in your answer to part (a),what nutrients could you supply in the media to getspore growth?

Question

The pathway for arginine biosynthesis in Neurospora
crassa involves several enzymes that produce a series
of intermediates.
ARG-E ARG-F ARG-G ARG-H
N-acetylornithine → ornithine → citrulline → argininosuccinate → arginine
a. If you did a cross between ARG-E− and ARG-H−
Neurospora strains, what would be the distribution
of Arg+ and Arg− spores within parental ditype and
nonparental ditype asci? Give the spore types in
the order in which they would appear in the ascus.
b. For each of the spores in your answer to part (a),
what nutrients could you supply in the media to get
spore growth?

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