Question

How does microevolution differ from macroevolution ?

• A. Microevolution is change in small portion while macroevolution is change in large portion
• B. Microevolution is the gradual change in genetic frequencies while macroevolution is the accumulation of such changes over time
• C. Microevolution is non-genetic while macroevolution is genetic
• D. Microevolution is observable while macroevolution is not

Hint:

Microevolution involves small genetic changes within populations, while macroevolution represents long-term accumulation of those changes leading to major evolutionary transformations.

Answer 1

The Correct Option is B

Concept: Evolution refers to genetic and biological changes occurring in populations over generations. Evolutionary changes may occur on a small scale or over very long periods leading to major transformations. These are categorized as:
• Microevolution,
• Macroevolution. Understanding the difference between the two is a central concept in biological anthropology and evolutionary biology.

Step 1: Understanding microevolution. Microevolution refers to: \[ \text{Small-scale genetic changes within a population} \] These changes occur due to:
• Mutation,
• Natural selection,
• Genetic drift,
• Gene flow. Microevolution changes:
• Allele frequencies,
• Traits within populations,
• Adaptations over generations. Thus, it represents gradual genetic change within species.

Step 2: Understanding macroevolution. Macroevolution refers to: \[ \text{Large-scale evolutionary changes over long periods of time} \] It includes:
• Formation of new species,
• Evolution of major groups,
• Long-term accumulation of microevolutionary changes. Therefore: \[ \text{Macroevolution results from accumulated microevolutionary processes.} \]

Step 3: Analyzing the options carefully. Option (A): \[ \text{Change in small portion vs large portion} \] This statement is vague and scientifically inaccurate. Hence, incorrect. Option (B): \[ \text{Microevolution is gradual genetic change while macroevolution is accumulation of such changes over time} \] This statement correctly explains the scientific distinction. Hence, correct. Option (C): \[ \text{Microevolution is non-genetic while macroevolution is genetic} \] This is incorrect because both are genetic evolutionary processes. Option (D): \[ \text{Microevolution is observable while macroevolution is not} \] This is misleading because macroevolutionary evidence is observable through fossils, comparative anatomy, and evolutionary history. Thus, incorrect.

Step 4: Final conclusion. Therefore, the correct answer is: \[ \boxed{\text{(B) Microevolution is the gradual change in genetic frequencies while macroevolution is the accumulation of such changes over time}} \]