"Nothing in Biology Makes Sense

Except in the Light of Evolution"

- Theodosius Dobzhansky

This statement made by Theodosius Dobzhansky summarised succinctly the essence of Biology.
  • What prompted Dr Dobzhansky to make this statement?
  • Do you agree with him?
  • Do you understand what it means?
  • Take a moment to look back at the biological systems you have studied (respiration, homeostasis, photosynthesis etc.), can you explain them in terms of evolution?

Read the original article HERE and see if you agree with him after learning more about evolution.

Evolution is one of the most important concepts in all of science
It has become a unifying principle
It is a biological theory and not intended to be useful outside of science

How much do you really know about Evolution?






To learn more about the common misconceptions, read "Misconceptions about evolution and the mechanisms of evolution".

What do scientists think of evolution as a theory?

Watch the video that I will show you in class and answer the following questions:
  • Does theory becomes a fact?
  • Why is Evolution an important theory in Biology?
  • What is the key element of hypothesis or theory?
  • So what does a theory do?

But Evolution is JUST a theory

  • What is a theory in a scientific sense?
  • Do you need to see to “believe” in a theory?
  • What can scientists rely on theory for?
  • What are inferences based on?

What is evolution?

  • Evolution is a process that results in heritable changes in a population spread over many generations.
  • Biological evolution is change in the properties of populations of organisms that transcend the lifetime of a single individual.
  • Biological evolution refers to populations and not to individuals
  • Changes must be passed on to the next generation- heritable
  • Therefore it can also be defined as: 
any change in the frequency of alleles within a gene pool from one generation to the next

Open up the moodle window and read the full lecture under Explore

Here are some references to help you to understand better:
  1. An Introduction to Evolution
  2. Introduction to Evolutionary Biology
  3. History of Life _ Looking for Patterns