Why are synonymous substitutions expected to be more common than non-synonymous

Question

Why are synonymous substitutions expected to be more common than non-synonymous substitutions under the neutral theory? a. non synonymous mutations are eliminated by purifying selection b. synonymous mutations are rare c. non synonymous mutations are rare d. synonymous mutations are favorited by positive selection Why are synonymous substitutions expected to be more common than non-synonymous substitutions under the neutral theory? a. non synonymous mutations are eliminated by purifying selection b. synonymous mutations are rare c. non synonymous mutations are rare d. synonymous mutations are favorited by positive selection a. non synonymous mutations are eliminated by purifying selection b. synonymous mutations are rare c. non synonymous mutations are rare d. synonymous mutations are favorited by positive selection

Explanation / Answer

Answer- Synonymous substitutions expected to be more common than non-synonymous substitutions under the neutral theory because the synonymous substitutions will be tolerated but non-synonymous substitutions will be removed by purifying selection. Consequently non synonymous substitutions will be fewer than synonymous substitutions.

Hence the correct option is (a).

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