b. Neurospora has an arginine amino acid synthesis pathway shown below: ornithine citrulline arginine NH H2N H2N > H2N HO NH2 NH2 NH2 Enzyme A Enzyme B Enzyme C Gene A Gene B Gene C 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). |

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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b. Neurospora has an arginine amino acid synthesis pathway shown below:
ornithine
citrulline
arginine
NH
H2N
H2N
OH
H2N
HO
HO
NH2
NH2
ÑH2
Enzyme A
Enzyme B
Enzyme C
↑
↑
Gene A
Gene B
Gene C
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). |
Transcribed Image Text:b. Neurospora has an arginine amino acid synthesis pathway shown below: ornithine citrulline arginine NH H2N H2N OH H2N HO HO NH2 NH2 ÑH2 Enzyme A Enzyme B Enzyme C ↑ ↑ Gene A Gene B Gene C 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). |
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