The smallest unit in which evolution occurs is the
Correct answer: D. population
- A. individual
- B. cell
- C. organelle
- D. population
Explanation
An individual's genes are fixed for life, so it cannot evolve; what changes is the genetic makeup of populations as generations pass. This is why evolutionary biology always speaks of populations, never of single organisms.
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About Concept of Evolution
Evolution is the heritable change in populations over generations, driven by mutation, recombination, natural selection, genetic drift and reproductive isolation. Questions examine variation, adaptation, survival and reproduction, speciation, fossil and anatomical evidence, and the difference between individual acclimatization and evolutionary change in a population.
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