Answered: 6. A diploid strain of yeast was made…

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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6. A diploid strain of yeast was made by mating a haploid
strain with a genotype w−, x
−, y
−, and z
− with a haploid
strain of opposite mating type that is wild type for these
four genes. The diploid strain was phenotypically wild
type. Four different X-ray-induced diploid mutants
with the following phenotypes were produced from
this diploid yeast strain. Assume a single new mutation is present in each strain.
Strain 1 w− x+ y− z+
Strain 2 w+ x− y− z−
Strain 3 w− x+ y− z−
Strain 4 w− x+ y+ z+
When these mutant diploid strains of yeast go through
meiosis, each ascus is found to contain only two viable
haploid spores.
a. What kind of mutations were induced by X-rays to
make the listed diploid strains?
b. Why did two spores in each ascus die?

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