1. Answer key posted on the class webpage
Office hours: Th 11:30am-2pm F 12:30-1:30pm
Exam Error Worksheet
Bonus #1 due F 2/15

2. Evolution:
A species’ genetic component changes as the individuals reproduce due to…
Non-random changes (natural selection)
Random changes (genetic drift/bottleneck)
Mutations add new alleles or genes

3. Evolution can occur randomly, by genetic drift.
CB 23.7
Evolution can occur randomly,
by genetic drift.

4. Other random evolution, Bottleneck
CB 23.8
Other random evolution,
Bottleneck

5. northern elephant seals…
CB 23.8
Bottleneck:
northern elephant seals…
In 24 genes studied, there was no variation (all homozygous).

6. Evolution:
A species’ genetic component changes as the individuals reproduce due to…
Non-random changes (natural selection)
Random changes (genetic drift/bottleneck)
Mutations add new alleles or genes

7. Mutations add new alleles/genes,
that are then subject to selection/drift

8. CB 23.13
Coincidence of malaria and sickle-cell anemia
How could this occur?

9. Mutations are subject to Drift and Selection
Replication
Drift
Selection
Generation 1
Generation 2
Generation 3
Generation 4
Generation 5

10. What determines advantageous traits?
CB 23.12
Reproduction/
Selection

11. changes drive evolution.
CB 25.3
Environmental
changes drive evolution.

12. 250 mya
180 mya
CB 26.20
135 mya
65 mya
current

13. The environment is in constant flux
CB 22.3
The environment is in constant flux

14. Changing environment can separate populations and lead to new species…
CB 24.5
Changing environment can separate populations and lead to new species…

15. Separation does not need to be geographic
Flies raised in different environments prefer to mate with individuals from the same environment...

16. Flies raised in different environments prefer to mate with individuals from the same environment...

17. Evolution does not always occur at the same rate.
CB 26.8
Evolution does not always occur at the same rate.

18. Why are intermediate traits sometimes hard to find?
CB 24.13
Why are intermediate traits sometimes hard to find?

19. What drives evolution?
What changes selection criteria?

20. The rate of evolution depends on the rate of environmental change.
CB 26.8
The rate of evolution depends on the rate of environmental change.

21. CB 26.8
Dinosaur extinction

22. CB 26.9
an Asteroid impact, 65 mya

23. Where did we come from?

24. Answer key posted on the class webpage
Office hours: Th 11:30am-2pm F 12:30-1:30pm
Exam Error Worksheet
Bonus #1 due F 2/15