Below Are Short Fragments of DNA Sequences from Two Yeast

question 154

Multiple Choice

Below are short fragments of DNA sequences from two yeast strains (A and B) , which have been diverging from each other, as well as a short fragment from their common ancestor (C) . Yeast A: TGACTGCAAACATCCTAG
Yeast B: TGCCTGGACACATCGAAG
Yeast C: TGCCTGGAAACCTCCTAG
What type of information would best allow you to detect whether back substitutions occurred at any of the 18 nucleotides of the sequence as strain A evolved from the common ancestor?

• A) Additional sequences from strain A from regions near the 18 nucleotides
• B) Additional sequences from the ancestor from regions near the 18 nucleotides
• C) Phenotypic data from strain A and the ancestor
• D) The 18 nucleotides from yeast samples taken at various times between the ancestor and contemporary strain A
• E) Sequence data from closely related strains

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