Name: _______________________________________
Period: _______
Genetic Drift: the Founder Effect & the Bottleneck Effect
Introduction
1. What is genetic drift?
2. How is genetic drift related to evolution and Hardy-Weinberg Equilibrium?
The Founder Effect
1. Read the article: http://www.tristandacunha.org/about-tristan/
2. Answer the following questions:
a.
What is the most interesting fact about the island?
b.
Where is the island located?
c.
What is the islands' population size?
d.
How many surnames are present in the island?
e.
If the island is so remote, has marriage between second cousins occurred?
f.
What possible health effects may occur due to marriage between cousins on the island?
g.
How might this effect the genetic diversity of the individuals on the island? How is this case study an example
of the founder effect?
The Bottleneck Effect
1. Go to: http://wps.pearsoncustom.com/wps/media/objects/2127/2178207/14_02.html
2. Click on Part I (upper left corner) to run the animation.
3. After the animation runs, click on Part II (upper left corner) and answer the following questions:
a.
What are 3 consequences that can result from population bottlenecks?
b. For each consequence, explain why this is a problem for the resulting population.
4. Research one of the following threatened species: northern elephant seal, giant panda, American bison, or cheetahs.
How is the species you selected impacted by genetic bottlenecks?