The DNA Sequence of a Conserved Region of the Mouse

question 18

Multiple Choice

The DNA sequence of a conserved region of the mouse Pax6 gene is from 77 to 85 percent identical to that of homologs from distant animal relatives. Yet the amino acid sequence identity among the homologs is 100 percent. How can this be?

• A) The genetic code is degenerate.
• B) There were errors in transcription.
• C) There was a frame-shift mutation.
• D) Codon usage varies.
• E) Both a and d

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