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Inheritance & EvolutionStudy Notes

Example: Antibiotic Resistance

Part of Evolution — GCSE Biology

This study notes covers Example: Antibiotic Resistance within Evolution for GCSE Biology. Theory of evolution, natural selection, and evidence for evolution It is section 4 of 12 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 4 of 12

Practice

26 questions

Recall

25 flashcards

Example: Antibiotic Resistance

  1. Random mutation gives some bacteria resistance to antibiotic
  2. Antibiotic kills non-resistant bacteria
  3. Resistant bacteria survive and reproduce
  4. They pass on resistance allele to offspring
  5. Eventually, most of population is resistant
  6. The antibiotic no longer works

Example: MRSA — "superbug" resistant to many antibiotics

Visual: Natural Selection

Natural selection diagram showing the 4 steps (variation, competition, survival, reproduction), peppered moth example before and after industrial revolution, and antibiotic resistance in bacteria

Remember: Variation → Competition → Survival of fittest → Reproduction → Alleles become more common over generations

Keep building this topic

Read this section alongside the surrounding pages in Evolution. That gives you the full topic sequence instead of a single isolated revision point.

Evidence for EvolutionHow It Works: Natural Selection and EvolutionThe Story: The Survival of the FittestNatural Selection — Step by Step

Practice Questions for Evolution

What is evolution?

  • A. The gradual change in living organisms over time
  • B. The growth of an individual organism
  • C. Animals moving to different habitats
  • D. The creation of new organisms from nothing
1 markfoundation

Describe three pieces of evidence that support Darwin's theory of evolution.

4 marksstandard

Quick Recall Flashcards

What is the analogy between natural selection and the video game respawn system?
In a multiplayer game, players with advantageous traits survive and respawn, leading to their increased representation in subsequent rounds, much like how natural selection favors certain characteristics in an organism.
What is the main idea behind natural selection?
The process by which individuals with advantageous characteristics are more likely to survive and reproduce, leading to gradual change in species over time.

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Evidence for Evolution

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How It Works: Natural Selection and Evolution