Which concept involves small, adaptive changes within a species?

Which concept involves small, adaptive changes within a species?

• A. Microevolution
• B. Macroevolution
• C. Spontaneous Generation
• D. Supernatural

Answer: (A)

Microevolution is the idea that small, adaptive changes happen within a population over generations. It focuses on shifts in allele frequencies from one generation to the next due to mechanisms like natural selection, mutation, gene flow, and genetic drift. Over time, these incremental changes accumulate and you see variation within the species, such as different color forms in a moth population or bacteria developing drug resistance. This is distinct from macroevolution, which looks at larger-scale changes that can lead to new species and broader patterns across lineages. Spontaneous generation is an outdated notion about life arising from nonliving matter, and the supernatural falls outside scientific explanations. So the concept describing small, adaptive changes within a species is microevolution.

Microevolution is the idea that small, adaptive changes happen within a population over generations. It focuses on shifts in allele frequencies from one generation to the next due to mechanisms like natural selection, mutation, gene flow, and genetic drift. Over time, these incremental changes accumulate and you see variation within the species, such as different color forms in a moth population or bacteria developing drug resistance. This is distinct from macroevolution, which looks at larger-scale changes that can lead to new species and broader patterns across lineages. Spontaneous generation is an outdated notion about life arising from nonliving matter, and the supernatural falls outside scientific explanations. So the concept describing small, adaptive changes within a species is microevolution.