6. Isolating spontaneous yeast mutants is typically performed in haploid rather than diploid strains. What is...
6. Isolating spontaneous yeast mutants is typically performed in haploid rather than diploid strains. What is the main rationale for doing this?
Homework Answers
Isolation of spontaneous yeast mutants is generally performed in haploid strains. This is due to the fact that it is easier to identify recessive mutants in the haploid background. Haploid strains contain a single set of the genome. So, mutation of the single allele results in the phenotype for a recessive allele
.
If we take a diploid yeast strain, both the alleles have to be
mutated for the recessive phenotype to appear. So, the diploid M1
population is allowed to self to produce M2 so that recessive
allele can attain homozygosity i.e. we have to look for the
recessive phenotype in the next generation. If we use a haploid
strain, we can observe the phenotype in the M1 generation
itself.
Dominant mutations can appear in
both homozygous and heterozygous conditions.
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