Answer:
The answer is (b) A population of bacteria is polymorphic for a single nucleotide polymorphism that resulted from a synonymous mutation.
Explanation:
Phenotypic variance means a change, a mutation on the phenotype of beings, like animals, plants or even microorganisms.
In the examples above, option (a) is about snakes with different colors, having different behaviours, the phenotype changes.
For example (c) a uniform population of barnacles shows differences in their phenotype in wavy environments, more muscular reproduction organs.
In example (d) human individuals differ in heigt.
For example (e) finches have their bill size increase.
I hope it works!
