Answered: Neurospora of genotype a + c are…

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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Neurospora of genotype a + c are crossed with
Neurospora of genotype + b +. (Here, + is shorthand
for the wild-type allele.) The following tetrads are
obtained (note that the genotype of the four spore
pairs in an ascus are listed, rather than listing all
eight spores):
a + c a b c + + c + b c a b + a + c
a + c a b c a + c a b c a b + a b c
+ b + + + + + b + + + + + + c + + +
+ b + + + + a b + a + + + + c + b +
137 141 26 25 2 3
a. In how many cells has meiosis occurred to yield
these data?
b. Give the best genetic map to explain these results.
Indicate all relevant genetic distances, both between
genes and between each gene and the centromere.
c. Diagram a meiosis that could give rise to one
of the three tetrads in the class at the far right in
the list

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