Exploring Genetic Drift and Its Effects

Mr. Anderson's video on genetic drift explains how random evolutionary changes affect allele frequencies in a gene pool. He uses examples like the bottleneck and founder effects to illustrate how population size impacts genetic diversity. The video includes graphical representations and real-world examples, such as the northern elephant seal and the island of Pingelap, to demonstrate these concepts.

What does genetic drift result in within a gene pool?

• Decreased allele frequencies

• Random changes in allele frequencies

• Increased genetic diversity

• Stable allele frequencies over time

What role does chance play in genetic drift?

• A deterministic role

• A minor role

• A significant role

• No role

What happens to allele frequencies when population size increases?

• They become more stable

• They decrease consistently

• They change more rapidly

• They are unaffected by population size

What does the law of large numbers imply about genetic drift?

• It has no effect on genetic drift

• It increases the rate of genetic drift

• It stabilizes allele frequencies in large populations

• It decreases genetic diversity

What is the bottleneck effect?

• A sudden increase in population size

• A decrease in allele frequencies due to migration

• A sharp reduction in a population's size

• An increase in genetic diversity

What is the founder effect?

• A phenomenon where allele frequencies increase suddenly

• An increase in population size on an island

• A genetic drift that occurs when a new colony is established

• A situation where dominant alleles become recessive

How does genetic drift affect isolated populations?

• Causes random changes in allele frequencies

• Increases their size

• Leads to new adaptations

• Stabilizes their gene pool

How did the Northern Elephant Seal population change due to the bottleneck effect?

• Stable population size

• Decreased genetic diversity

• Increased genetic diversity

• Increased population size

What was a significant consequence of the bottleneck effect on the Northern Elephant Seal?

• Unchanged skull morphology

• Decreased skull symmetry

• Improved fitness

• Increased skull symmetry

What unusual trait became prevalent in Pingelap due to the founder effect?

• Enhanced vision

• Decreased genetic diversity

• Increased height

• Complete colorblindness