NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a...

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NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Transcript of NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a...

Page 1: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

NOTES: GENETIC DRIFT

Objective: What is genetic drift and how does it affect the diversity of a population?

Page 2: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Title Box 1: What is genetic drift?

Changes in a small population’s allele frequency due to random chance

Not based on fitness its about luck

Page 3: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Title Box 2: What causes genetic drift?

Natural disasters: hurricanes, volcano, tsunami, earthquakes, fire, etc.

Random Events: stepped on, ran over, picked up, etc.

Page 4: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Title Box 3: What are the types of genetic drift?

Founder’s effect: part of the population immigrates to and colonizes a new area

Bottleneck effect: a disaster happens leaving few survivors from an original population

Page 5: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Talk it Over and Write it Down: Look at the population of cats before and after. 1)What do you notice happen to the

phenotypes?2)What happened to genetic diversity? 3)What type of genetic drift

happened?

Title Box 4: Quick Write

DIE in flood

Page 6: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Title Box 5: What does genetic drift do to a population?Decreases diversity within a population

Affects small populations

Page 7: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Genetic Drift WS

1. Roll dice put dot next to that # worm

2. Example roll 3 put dot next to worm 3

3. Roll 5 more times (total 6 times)

4. Color the next generation worms those colors with dots

5. Repeat until you get to generation 4

Page 8: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

Title Box 6: Exit Ticket

At the bottom of today’s notes answer the following questions in complete sentences:

Explain how genetic drift affects the diversity of a population. How does this affect the fitness of the population?

Page 9: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

What is genetic equilibrium?

When allele frequencies remain the same

No change means no evolution

Page 10: NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?

What are the conditions for genetic equilibrium?

1. Random mating 2. Large population 3. No immigration/

emigration 4. No mutations 5. No natural

selection