Genetic Drift Vs. Natural Selection

Genetic drift is more likely to happen in...

• aquatic populations

• small populations

• terrestrial populations

• older populations

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

• random chance

• natural selection

• non-random mating (sexual selection)

• artificial selection

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

• Humans choose two dogs they like the characteristics of and breed them together.

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

• In colder areas, white foxes survive and reproduce more than brown ones.

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 seal population will now be LESS genetically diverse

• The seal population will now be MORE genetically diverse

• There is equal genetic variety compared  to the original population 

The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called

• the founder effect
• the bottleneck effect

One day a group of scientists collected a small group of brown anole lizards from a large group of the lizards.  Then they placed this small group of lizards on an island that had no brown anole lizards on it.  What is this an example of?

• Bottleneck Effect
• Founder Effect

This occurs when a large population is drastically reduced by an event such as a natural disaster; the population's new gene pool only contains alleles from the survivors

• Founder effect

• Bottleneck effect

• Meteor effect

• Natural selection

If thick-shelled oysters are tougher to crack open than thinner shelled oysters, crabs will be less able to prey upon them, and thick-shelled oysters will be more likely to survive and reproduce. What Is this an example of?

• Artificial Selection

• Natural Selection

• Genetic Drift

A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.

• natural selection

• Genetic Drift

A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.

• bottleneck effect

• founder effect