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.
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.
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
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Transcribed Image Text: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 +с abс
+ + c
+ bc ab+
a + c
a +с abc a+с abc ab+ abc
+ b +
+ + +
+ b +
+ + +
+ + c
+ + +
+ b +
+ + + a b +
a + +
+ + c
+ b +
137
141
26
25
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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