Summary and Exam Tips for Natural Selection
Natural Selection is a subtopic of Evolution, which falls under the subject Science in the IB MYP curriculum. Natural selection, often described as "survival of the fittest," is a concept introduced by Charles Darwin. It refers to the process where individuals with traits best suited to their environment have a higher chance of surviving and reproducing. Over time, these advantageous traits become more common in the population. For instance, giraffes with longer necks survive better when food is scarce at lower levels, leading to a population predominantly with long necks. This process is crucial for evolution, as it leads to the development of species better adapted to their environments. However, natural selection can also be harmful, as seen in antibiotic resistance. Bacteria that survive antibiotic treatments due to mutations can reproduce, leading to populations resistant to antibiotics, posing significant challenges in healthcare. In contrast, artificial selection involves humans selecting desirable traits in plants and animals, such as larger fruits or more productive livestock, to enhance agricultural output. This process, while similar to natural selection, is driven by human choice rather than environmental pressures.
Exam Tips
- Use precise terminology: Always incorporate key biology terms in your answers to demonstrate understanding.
- Clarify your points: Avoid vague terms like "it" or "they" without clear references.
- Understand the question: Differentiate between 'what' and 'why' questions to provide accurate responses.
- Mark allocation: Let the number of marks guide the depth of your answer.
- Practice with examples: Use examples like giraffes or antibiotic resistance to illustrate natural selection concepts effectively.
