Evolution Unit Review

An adaptation is something that:

• allows an organism to reproduce and pass on their traits

• allows organisms to survive and undergo mutations in their DNA

• increases the mortality rate of the population

• an organism no longer needs to survive

Organisms with a high fitness could be described as:

• the most likely to survive and reproduce

• the strongest organism

• the fastest organism

• the biggest organism

Natural selection is the process that passes down ____________________ traits that increase the chance of an organisms survival.

• Same

• Old

• Useless

• Favorable

Mutations are

• Long Time evolutionary events

• Short time evolutionary events

• Changes in your DNA

• When an organism looks very similar win physical resemblance to other objects

An adaptation is

• Organisms better suited for their environment will survive and reproduce

• Any physical or behavioral characteristic that helps an organism to better survive

• Theory that organisms have changed gradually over a long period of time to form mew organisms

Natural Selection is the idea that

• Organisms better suited for their environment will survive and reproduce

• Any physical or behavioral characteristic that helps an organism to better survive

• Theory that organisms have changed gradually over a long period of time to form mew organisms

Which of the following is the best statement about natural selection?

• Some individuals in a population have a variation that gives them an advantage to survive and reproduce.

• Most populations of organisms evolve to become more and more alike, eventually becoming genetic clones.

• If a population becomes isolated from others, the possibility for mutations to occur decreases and extinction results.

• A stable environment and less variations in a population's gene pool promotes evolution of a new species. 

A rabbit population exhibits variation in fur coat thickness in a temperate habitat. A gradual and lasting cooling in the habitat's climate decreases the diversity of the rabbits' fur coat thickness. Which of the following is the best reason for this decrease?

• Only rabbits with a brighter fur coat will survive.

• Only rabbits with a darker fur coat will survive.

• Only rabbits with a thinner fur coat will survive.

• Only rabbits with a thicker fur coat will survive.

Which of the following is true of variations?

• They are necessary for natural selection.

• They are caused by mutations and sexual reproduction.

• They exists in most populations.

• All of the above.

Which of the following BEST describes the relationship between variations and adaptations?

• all variations are adaptations, but not all adaptations come form variations

• all adaptations are variations and all variations help organisms survive

• variations result from adaptations organisms make to the environment

• variations are adaptions only if they help organisms survive