Genetic Drift & Gene Flow

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

This mechanism of evolution occurs when individuals migrate between populations.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection

A virus killed most of the seals in the North Sea (e.g. dropped the population from 8000 to 800).  In an effort to help preserve the species, scientists caught 20 of the remaining seals and used them to start a new population in the northwest Pacific Ocean.  Which of the following statements would accurately describe the new   population?  

• The new seal population is genetically less diverse than the original population 
• The new seal population is genetically more diverse than the original population
• There is equal genetic variety compared  to the original population 
• None of the answers

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

All of the genetic information found in a population.

• population

• genetic drift

• evolution

• gene pool

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