1. 4.2 Evolution = change over time

2. 4.2 Evolution = change over time
Natural resistance
Selection
“nature” “Humans” “chemicals”
Darwin Lamark
Artificial Selection
Theories

3. Natural Selection Nature will decide or choose which traits fit best
Natural Selection Nature will decide or choose which traits fit best. Aka – “Survival of the fittest” .

4. 2 Natural Selection Theories:
1. Charles Darwin
Believed organisms born with variety.
This led to success for some, called adaptations (they worked).
therefore pops. Change over time
Cheese: DarWIN
2. Lamark
Believed organisms AQUIRED desirable traits in their lifetime.
These then passed on
Cheese:
LAMARK IS LAME!

5. May also lead to Coevolution = animals are adapted to each other and cannot survive without the other now

6. Does “Man” influence Natural Selection???
Example – Pollution and the peppered moth

7. Artificial Selection
Humans will decide which traits will be passed onto the next generation

8. Artificial Selection Example…
Selective breeding of dogs from a domesticated wolf by humans for specific characteristics.

9. Natural Selection vs Artificial Selection

10. Evolution of Resistance
Resistance is the ability of one or more organisms to tolerate a particular chemical designed to kill it.
So in essence, we are creating a population of insects that are resistant by trying to control them with chemicals.

11. Reports of lice resistance started appearing in the mid 1990s in the United States, Europe and Australia. A 2014 study suggested the potential for resistance is high in several areas in the United States and Canada. Among lice samples from 84 people in these countries, 99.6% of the insects had mutations in genes that could allow them to survive the insecticides permethrin and pyrethrin, which are the active ingredients in over-the-counter remedies. In the past, this group's research has received financial support from pharmaceutical companies that make such prescription medicine

12. Could their be an easier way to control pests without using chemicals???
Fly traps
Take out trash often
No water