Introduction:
Mathematical biology and population genetics are two important areas of study in the field of biology. While mathematical biology focuses on using mathematical models and techniques to study biological phenomena, population genetics examines the genetic composition of populations and the factors that influence genetic variation. When deciding whether to revise these concepts separately or together in the Mathematics Optional subject, one must consider the interplay between the two fields and the benefits of studying them together or separately.

Revising separately:
- Depth of understanding: By revising mathematical biology and population genetics separately, you can delve deeper into each subject and gain a more comprehensive understanding of the key concepts, theories, and mathematical models associated with them.
- Focus on specialization: Separate revision allows you to specialize in either mathematical biology or population genetics, enabling you to develop expertise in one area and potentially pursue research or professional opportunities in that specific field.
- Clear organization: Studying each subject separately provides a clear organizational structure for your revision, allowing you to allocate dedicated time and resources to each area and avoid confusion or overlap.

Revising together:
- Integration of concepts: Mathematical biology and population genetics are closely related and often overlap in their applications. Studying them together can help you understand how mathematical models are used in population genetics to predict and analyze genetic changes and evolutionary processes.
- Enhanced problem-solving skills: By revising both subjects together, you can develop a broader range of problem-solving skills that can be applied to various biological scenarios. This interdisciplinary approach can help you tackle complex problems and think critically about the mathematical and genetic aspects simultaneously.
- Real-world relevance: Many real-world phenomena, such as disease spread or evolutionary dynamics, require an understanding of both mathematical biology and population genetics. Studying them together can provide a more holistic perspective and enable you to apply your knowledge to real-world situations effectively.

Conclusion:
Both revising mathematical biology and population genetics separately or together have their advantages. It ultimately depends on your personal preferences, goals, and time constraints. If you have a specific interest or career path in mind, revising them separately may be more beneficial. However, if you want to develop a broader understanding and enhance your problem-solving skills, studying them together can be advantageous. Remember to allocate sufficient time and resources to each subject and ensure a thorough understanding of the key concepts in both areas.