4.3.12

Evolution

Test yourself

The Evidence for Evolution

The discovery of genes as a mechanism (way) to inherit characteristics and create variance supported the theory of evolution. In addition to this, the two main sources of evidence are:

Illustrative background for FossilsIllustrative background for Fossils ?? "content

Fossils

  • Fossils show the gradual changes in organisms over vast periods of time.
Illustrative background for Antibiotic-resistant bacteriaIllustrative background for Antibiotic-resistant bacteria ?? "content

Antibiotic-resistant bacteria

  • Natural selection neatly explains this phenomenon:
  • Bacteria reproduce rapidly.
  • Mutations occur during reproduction.
  • If a mutated bacterium is resistant to antibiotics, it will survive exposure to antibiotics and go on to reproduce.
  • This bacterium will represent the original ancestor of a new resistant strain.

Jump to other topics

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

Unlock your full potential with Seneca Premium

  • Unlimited access to 10,000+ open-ended exam questions

  • Mini-mock exams based on your study history

  • Unlock 800+ premium courses & e-books

Get started with Seneca Premium