In Yeast, There Are Three Gene Products Required to Synthesize

question 30

Multiple Choice

In yeast, there are three gene products required to synthesize the amino acid lysine. You cross two haploid lysine auxotrophs to form a diploid. The diploid fails to grow on plates lacking lysine. Which of the following can you definitively conclude?

• A) The haploid strains have identical mutations in the same genes.
• B) The haploid strains must belong to the complementation group encoding the first enzyme in the biosynthetic pathway.
• C) The haploid strains have identical mutations in different genes.
• D) The haploid strains have mutations in the same gene.
• E) The haploid strains have mutations in different genes.

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