Evolution Introduction 17.2 & 17.3

Which type of evolution produces variation within species and is observable in nature?

• microevolution
• macroevolution

Which type of evolution would produce new species?

• microevolution
• macroevolution

Nature provides the variations and humans select the variants they find useful.

• Natural selection
• Artificial selection
• Genetic Drift
• Founder effect

Darwin's theory of evolution is based on the Struggle for Existence. Which 2 of the following define the struggle for existence?

• More offspring are born than can survive

• organisms compete for resources

• how well adapted an organism is to it's environment

• change in a population over time

What was Darwin's hypothesis?

• certain individuals are better adapted to their environment
• only the strongest organisms will reproduce
• certain individuals with acquired traits are more likely to survive
• populations change randomly over time

What are adaptations?

• A trait that can increase an organism's ability to survive.
• A trait that can increase an organism's ability to reproduce.
• A trait that increase an organisms ability to survive and reproduce.
• Adaptations only occur in physical traits

An organisms's ​ ​ (a)   is how well it can survive and reproduce in its environment.

• fitness
• adaptation
• microevolution
• macroevolution
• evolution

The process by which organisms in nature with variations most suited to their environments will survive and leave more offspring.

• natural selection
• fitness
• artificial selection
• genetic drift

True or False. Natural selection will act on both inherited and acquired traits.

• False
• True

Select the 3 requirements for natural selection to occur.

• More offspring are produced than can survive.
• Natural variation affects the ability to survive and reproduce
• Fitness varies among individuals
• Natural disasters drastically reduce the size of a population
• Organisms with desirable traits are bred.