. A diploid strain of yeast was made by mating a haploidstrain with a genotype w−, x−, y−, and z− with a haploidstrain of opposite mating type that is wild type for thesefour genes. The diploid strain was phenotypically wildtype. Four different X-ray-induced diploid mutantswith the following phenotypes were produced fromthis 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 throughmeiosis, each ascus is found to contain only two viablehaploid spores.a. What kind of mutations were induced by X-rays tomake the listed diploid strains?b. Why did two spores in each ascus die?c. Are any of the genes w, x, y, or z located on thesame chromosome?d. Give the order of the genes that are found on thesame chromosome
. 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
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?
c. Are any of the genes w, x, y, or z located on the
same chromosome?
d. Give the order of the genes that are found on the
same chromosome
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