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Two primary processes—mutation and sexual reproduction—are responsible for the genetic variety in a population. The primary source of new alleles, or new genetic variation in any population, is a mutation, a change in the DNA. Three possible phenotypic consequences can result from the genetic changes a mutation brings about.

The correct option is A.

The term "phenotype" describes a person's distinguishable characteristics, such as height, eye color, and blood type. Both a person's genomic makeup (genotype) and environmental circumstances affect their phenotype. The phrase "blue beak" describes a phenotypic trait of a particular individual duck.

b. Describes a change in the genotype of the organism

c. Describes a quality of "most" cheetahs and is not specific to an organism