The figure below shows the life cycle of the fungus Neurospora. The adult stage of the Neurospora is a multicellular haploid: a. Between which two stages of the Neurospora life cycle do most mitotic cell divisions occur?
The figure below shows the life cycle of the
a. Between which two stages of the Neurospora life cycle do most mitotic cell divisions occur?
b. Neurospora has an arginine amino acid synthesis pathway shown below:
Suppose I have a neurospora strain that has a mutation such that it will not grow unless I supplement the media (food) with arginine (but not with citrulline or ornithine). What gene is mutated? Explain your reasoning.
c. Suppose I take the strain above that only grows with arginine supplements and cross it to a different mutant Neurospora strain that grows with arginine and citrulline supplements but not ornithine supplements. Assming genes A, B and C are unlinked and there is only one mutation per strain:
i) What percentage of the progeny will grow on ornithine?
ii) What percentage on citrulline?
iii) What percentage on arginine?
Show your work for i), ii) and iii). [Can be answered in less than 100 words]
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