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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Hfr (thrt, azi, ton", lact, galt, str) and F¯ (thr¯, azi³, ton³, lac, ga, str) cells were mated in an interrupted mating
experiment. The results of replica plating the Str Thr* exconjugants to test for the presence of the other four genes are
shown in the graph.
Percentage of cells with Hfr genetic
markers among Str' Thr* recombinants
100
80
60
40
20
0
0
Multiple Choice
I
30
azi'
lac+
gal+
I
10
20
40
Minutes prior to interruption of conjugation
ton'
gene order could not be determined.
I
50
the fraction of cells with each marker would be 100%.
90%
85%
If a sample had been taken at 70 minutes after mating instead of at 1-minute intervals, then
40%
20%
gene order could be determined because the final fraction of exconjugants with a marker decreases as distance from the origin of transfer increases.
gene order could be determined because the final fraction of exconjugants with a marker increases with distance from the origin of transfer.
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The correct answer is " gene order could be determined because the final fraction of exconjugants with a marker decreases as the distance from the origin of transfer increases".
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