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?
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]
Extracted text: ornithine citrulline arginine -> MAN HO, HAN Enzyme A Enzyme B Enzyme C ↑ ↑ Gene A Gene B Gene C
Extracted text: Adult Germinating conidium Vegetative mycelum, Spore Gametes Ascospore HAPLOID Meiosis Fertilization DIPLOID Ascus begine o bm Zygote Ai • 2001 Sinauer Associates, Inc.