EVOLUTION PART 3 – NATURAL SELECTION
Ms. Carter
MUTATIONS are changes in our DNA. Sometimes, mutations are harmful and cause death. Other times, mutations give the individual an advantage and allow these individual to survive certain environmental conditions better. Organisms with good mutations survive and have offspring. Some offspring inherit the good mutation, survive, have children and so on. Mutations that allow organisms to survive and pass on to future generations are part of the evolutionary process.
Background essay: Double Immunity
- Why are some people resistant to the HIV virus today?
Video: Double Immunity
- Why doesn’t the virus enter the cells of people with this mutation?
- What is the evolutionary importance of the mutation that cause pople to durvive the plague 700 years ago?
Watch the video and read the essay below it
- Why are some people resistant to malaria?
- If sickle cell is lethal, why is it still present in populations? How is it pass on from generations to generations? Explain.
Some organisms survive the hazards of their environment by changing themselves to blend with their surrounding.
VIDEO: Evolution of Camouflage
Read the essay and watch the video:
- Explain how is camouflage related to evolution?
After playing this interactive write a short essay on how camouflage allows for natural selection to take place in a prey/predator relationship.
