1. Other mechanisms of evolution
11.3

2. Student Self Assessment
1. I barely know what the subject is. I need significant help.
2. I think I’m starting to get it, but I need some clarification. I do make some mistakes.
3. I have a strong grasp of the subject. I make few mistakes.
4. I understand this as well as any other student in this classroom. I can help others.

3. Recall that a homologous structure is a feature that is similar in structure but appears different in different organisms. REMEMBER that homologous structures are similar in origin.

4. Recall that a vestigial structure is a structure or organ that is underdeveloped or unused. It once had a use in previous ancestor.

5. The movement of alleles (genes) from one population to another is called gene flow.

6. If I randomly pick out 50 marbles,
I am likely to still have a high
diversity of colors.

7. If I pick out only 6 marbles, I am less
likely to have high diversity among
the 6. Why?

8. Changes in how common a gene occurs within a population (allele frequency) is known as genetic drift. Genetic drift causes a loss of genetic diversity.

9. The bottleneck effect can lead to genetic drift
The bottleneck effect can lead to genetic drift. It occurs when an event greatly reduces the size of a population. The Toba catastrophe of 70,000 BC is an example.

10. The founder effect occurs after a small number of organisms colonize a new area. Genetic drift causes a loss of genetic diversity.

11. Genetic drift can lead to a loss of genetic diversity. Why is this BAD???

12. The more genetic diversity within a species, the more likely that species will survive in a changing environment.

13. Student Self Assessment
1. I barely know what the subject is. I need significant help.
2. I think I’m starting to get it, but I need some clarification. I do make some mistakes.
3. I have a strong grasp of the subject. I make few mistakes.
4. I understand this as well as any other student in this classroom. I can help others.