Genetic Drift

Genetic drift is change in the allele frequency of a population due to...

• random chance
• natural selection
• non-random mating (sexual selection)
• artificial selection

 Genetic Drift is more likely to happen in... 

• aquatic populations
• small populations
• terrestrial populations
• older populations

Which of the following is an example of the bottle neck effect?

• 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.

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.

Group of organisms all of the same species, living in the same place at the same time.

• gene pool

• population

• species

• evolution

A change in the genetic composition of a population as a result of descending from a small number of colonizing individuals is called:

• founder effect
• bottleneck
• genetic drift
• gene flow

Natural selection states that organisms are best suited for their environment if they ____________ and ____________.

• Survive and Reproduce
• Survive and Predate
• Survive and Parasitize
• Survive and Adapt

According to the bead lab, Genetic drift (bottleneck or founder) tends to ___________ genetic variation (diversity)

• Increase
• Decrease
• Stabilize
• Exaggerate 

What do we call change over time?

• Evolution
• Natural Selection
• Natural Variation
• Speciation

(True/False) In the bead lab, genetic drift could result in the loss of a color from the population.

• True
• False