In yeast, there are three gene products required to synthesize the amino acid ly

Question

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? 0 The haploid strains have mutations in different genes The haploid strains have identical mutations in the same genes. O The haploid strains have identical mutations in different genes. O The haploid strains must belong to the complementation group encoding the first enzyme in the biosynthetic pathway The haploid strains have mutations in the same gene. Submit

Explanation / Answer

Last option is the correct option.

Reason: If the diploid yeast also has to be an auxotroph, we can only conclusively say that the haploid strains have mutations in the same gene. BUT we can never conclusively tell if the mutations were IDENTICAL.

NOTE: If you require further explanation please feel free to comment below. I will be happy to help you.

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