Genetic Drift and Population Effects

Mr. Anderson explains genetic drift, a random evolutionary change affecting allele frequencies in a gene pool. He demonstrates how genetic drift can lead to the elimination of alleles through random chance, especially in small populations. The video covers the bottleneck and founder effects, illustrating how these phenomena reduce genetic diversity. Real-world examples, such as the northern elephant seal and the island of Pingelap, highlight the impact of genetic drift on populations. The importance of population size in minimizing genetic drift is also discussed.

What is genetic drift primarily caused by?

• Natural selection

• Random chance

• Mutations

• Environmental changes

In a population simulator, what happens to genetic drift as the population size increases?

• Drift increases

• Drift decreases

• Drift becomes unpredictable

• Drift remains constant

What is the law of large numbers in relation to genetic drift?

• It increases genetic drift

• It stabilizes allele frequencies

• It causes mutations

• It leads to extinction

What happens to genetic diversity during a bottleneck effect?

• It increases

• It remains the same

• It decreases

• It becomes unpredictable

Which of the following is an example of the bottleneck effect?

• A mutation spreading through a population

• A small group colonizing a new area

• A large population being reduced to a few individuals

• A new species forming on an island

What was a significant consequence of the bottleneck effect on the northern elephant seal?

• Increased genetic diversity

• Decreased genetic diversity

• Decreased population size

• Increased population size

How did the bottleneck effect impact the skull symmetry of northern elephant seals?

• It had no effect

• It improved symmetry

• It caused asymmetry

• It made them more fit

What is the founder effect?

• A large population being reduced

• A small group starting a new population

• A mutation spreading through a population

• A species adapting to a new environment

What genetic condition became prevalent on Pingelap Island due to the founder effect?

• Increased height

• Complete color blindness

• Enhanced vision

• Decreased intelligence

What factor contributed to the high prevalence of color blindness on Pingelap Island?

• Environmental changes

• Mutations

• Inbreeding

• Natural selection