Genetic Drift Gene Flow

This mechanism of evolution occurs when individuals migrate between populations.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection

Which of the following is an example of natural selection?

• Bald Eagles are hunted until near extinction, population recovers.

• Small group of iguanas floats to an island, starts a new population.

• Red fox pups are more likely to survive in a snowy environment if they are born white.

• Farmer chooses seeds from largest apples to plant next year. This results in larger apples from year to year.

Five hundred years after the deer had established a flourishing population in the park, a few of them venture back to their original woods and have babies with the deer there.

• Genetic Drift
• Mutations
• Non-random mating
• Gene flow

What happens when species produce too many offspring?

• Species share the limited resources 
• Species eat less so that all can survive
• Only those that are least fit can survive
• Only those that are best fit can survive

If you take antibiotics only the resistant bacteria survive and the non-resistant bacteria die. This is an example of...

• Resistance

• Survival of the fittest

• How antibiotics work

Frogs with longer tongues are able to catch more food. Frogs with short tongues can't catch as much food and don't usually survive.

• Stabilizing Selection

• Directional Selection

• Disruptive Selection

Which graph shows disruptive selection?

• A

• B

• C

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

• Cheetah populations reach their lowest levels with reduced diversity and as they rebound are so genetically similar they appear to be inbred.

• Affected individuals with blue skin can trace their ancestry back to one of the first settlers in the region.

• The environment of a fox population changes and over time foxes who are white survive and pass on their genes to their offspring.

What mechanism of evolution occurs when allele frequencies change over generations due to random chance?

• Genetic Drift

• Mutation

• Natural Selection

• Gene Flow

What is the difference between genetic drift and natural selection. SELECT ALL THAT APPLY

• Natural Selection creates adaptations and Genetic Drift does not.

• Natural Selection is not random and Genetic Drift is.

• Natural Selection passes on any trait and Genetic Drift passes on specific traits.

• Natural Selection happens over a single generation and Genetic Drift happens over multiple generations.