1. Happy Mondays! 2/13/17
Which scientist proposed that organisms “acquired traits” throughout their lifetime, and then passed those traits on to their offspring?
A. Darwin
B. Lamarck
C. Mendel
D. Wallace
The process by which species of organisms change over time is referred to as
acquired traits
Darwinism
evolution
fitness

2. Natural Selection
The ability to survive and reproduce based off of differences in phenotype
Fit vs Unfit

3. Right vs Wrong Right! Wrong!
Organisms who has “fit” genes can compete, survive, and reproduce to pass on favorable genes.
Right!
Lamarck – Organisms will “acquire traits” in order to survive.
Ex- Giraffes stretch their necks in order to reach food.
Wrong!

4. Patterns of Natural Selection
Directional
Stabilizing
Disruptive

5. Directional Selection
Selection against one extreme
Fit to be ONE extreme

6. Stabilizing Selection
Selection against both extremes
Fit to be AVERAGE

7. Disruptive Selection Selection against the average
It is fit to be BOTH extremes

8. Practice
Babies that are born too small can lose heat too easily and may die, whereas babies being born too large can lead to complications during childbirth and the death of the mother or the baby. Identify selection type. A. Disruptive B. Stabilizing C. Directional

9. Practice
Robins typically lay up to four eggs. Larger clutches may result in malnourished chicks, while smaller clutches may result in no viable offspring. Identify selection type. A. Disruptive B. Stabilizing C. Directional

10. Practice
Light colored moths are better camouflages against light colored areas; likewise dark colored moths are better suited in dark areas. During the Industrial Revolution smog polluted the area shifting the area from light to dark. Identify the selection. A. Disruptive B. Stabilizing C. Directional