Mutations in the Third Position of Codons Are the Least

question 180

Multiple Choice

Mutations in the third position of codons are the least likely to affect the amino acid sequence.Mutations in the second position are most likely to change the amino acid sequence, whereas first-position mutations are intermediate.Based on what you know about molecular evolution, predict the relative rates of evolution for first-, second-, and third-position codon nucleotides, from least likely to most likely.

• A) First, second, third
• B) First, third, second
• C) Second, first, third
• D) Third, second, first
• E) Third, first, second

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