What describes genetic differences within a species?

• A. Gene pool
• B. Allele frequency
• C. Chromosomal mutation
• D. Genetic variation

Answer: (D)

Genetic variation describes the differences among individuals within a species. It encompasses all the differences in DNA sequences among members of the same species, which translate into variations in traits. This diversity arises from mutations, recombination during reproduction, and gene flow, and it provides the raw material for evolution and adaptation.

The other terms relate to aspects of a population’s genetics but don’t directly describe the differences themselves. A gene pool is the entire set of genes present in the population, which is the source of variation but not the variation described. Allele frequency is about how common each variant is in that population, not the existence of differences. A chromosomal mutation is one mechanism that can create variation, but it’s a specific type of change rather than the broad description of genetic differences within the species.