Week 6 Journal Questions (pg. 42)
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Transcript of Week 6 Journal Questions (pg. 42)
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NOTES: GENETIC DRIFT Objective: What is genetic drift and how does it affect the diversity of a population?
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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
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Title Box 2: What causes genetic drift?
Natural disasters: hurricanes, volcano, tsunami, earthquakes, fire, etc.
Random Events: stepped on, ran over, picked up, etc.
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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
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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
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Title Box 5: What does genetic drift do to a population?Decreases diversity within a population
Affects small populations
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Genetic Drift WS1. 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
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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?
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What is genetic equilibrium?
When allele frequencies remain the same
No change means no evolution
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What are the conditions for genetic equilibrium?
1. Random mating 2. Large population 3. No immigration/
emigration 4. No mutations 5. No natural
selection