Answered: In the fungus Neurospora, a strain that…

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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Question

In the fungus Neurospora, a strain that is auxotrophic for
thiamine (mutant allele t) was crossed with a strain that isauxotrophic for methionine (mutant allele m). Linear asci
were isolated and classified into the following groups: a. Determine the linkage relations of these two genes
to their centromere(s) and to each other. Specify
distances in map units.
b. Draw a diagram to show the origin of the ascus type
with only one single representative (second from right).

Spore pair
1 and 2
Ascus types
t+
t+
t+
t+
tm
tm
3 and 4
t+
tm
+ m
++
t m
++
5 and 6
+ m ++
t+
t m
++
t+
7 and 8
+ т +m
+ m
+ m
++
+ m
Number
260
76
4
54
1

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