How does genetics influence athletic performance in IB SEHS?

In IB SEHS, genetics explains why individuals vary in traits linked to performance, even with similar training. The most common examples are muscle fibre type distribution, body size and proportions, and aerobic capacity potential (often discussed via VO₂ max). Genetics can influence structural features like limb length or joint shape, which can affect leverage and movement efficiency. It can also influence physiological capacity, such as how high an athlete’s VO₂ max ceiling might be. However, genetics is best described as setting a range of potential rather than guaranteeing outcomes. Examiners reward answers that show genetics interacts with training, environment, and lifestyle.

Can training overcome genetic limitations?

Training can significantly improve performance in almost every athlete, which is a key point in IB SEHS evaluation. Endurance training can raise VO₂ max, strength training can increase force production, and practice can refine technique and movement economy. But genetics may still influence the upper limit of adaptation, meaning two athletes can improve but end at different final levels. That’s why it’s more accurate to write “training helps an athlete approach their genetic potential” than “training removes genetic limits.” Environmental factors like sleep, nutrition, coaching quality, and injury history also shape how much improvement is possible. In exam answers, combining these ideas shows balanced understanding.

How do IB SEHS exams test genetics and athletic performance?

Genetics questions in IB SEHS often ask you to explain mechanisms (like fibre types) and then evaluate them in context. You might be given a scenario about two athletes responding differently to the same program, and you’ll need to discuss genetic factors alongside training and environment. High-mark responses use specific examples (Type I vs Type II, VO₂ max ceiling, leverage from body proportions) rather than vague statements. Many questions also reward critique, such as noting that genetics does not guarantee success and that opportunity and coaching matter. Practising with exam-style prompts helps you write in the mark scheme’s language. RevisionDojo’s tools like Questionbank, Study Notes, Flashcards, AI Chat, and Grading tools are designed to make that practice repeatable and trackable.