Which of the following would best demonstrate that a given population has evolved?

• A. An increase in the population size due to abundant food resources
• B. A temporary migration of individuals into the population
• C. A measurable change in allele frequencies within the population over several generations
• D. A change in the physical environment without any genetic change in the population

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the concept of evolution in biology. Evolution refers to the change in the genetic composition of a population over successive generations, often measured as changes in allele frequencies.
2. Step 2: Analyze the options provided. Evolution is not demonstrated by population size changes due to food resources, as this is an ecological factor rather than a genetic change.
3. Step 3: Consider the temporary migration of individuals into the population. Migration can introduce new alleles, but temporary migration does not necessarily indicate a measurable genetic change within the population over generations.
4. Step 4: Evaluate the option regarding a change in the physical environment. Environmental changes can influence survival and reproduction, but without genetic changes, this does not demonstrate evolution.
5. Step 5: Focus on the correct answer: A measurable change in allele frequencies within the population over several generations. This is the hallmark of evolution, as it reflects genetic changes that persist and are passed down through generations.