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?

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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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]

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