Natural Selection

Natural selection relies on descent with modification.  What does this mean?

• The offspring are identical copies of their parents.

• The offspring are different in some ways than their parents.

Charles Darwin's theory of natural selection explained what?

• How random variation could produce complex life

• How random variation could produce only simple life

How long did the changes to cause these turtles to speciate (become to separate species) take?

• A single generation

• Thousands of years and many generations

Domestic animals are the result of humans selectively breeding wild animals.

• True

• False

If a farmer wants to produce a bigger crop, which of the following should he do?

• Choose any two plants in his field to breed.

• Choose the two largest plants that already have the genetic code for larger size.

What is natural selection?

• Traits that help an individual survive in harsh natural conditions become more common in a population.

• Favorable traits become less common in a population due to lack of pressure from the environment.

In this particular population of beetles, what traits are positively selected for?

• Beetles that are brown with red eyes.

• Bettles that are green and are hard for the chamelion to see.

Which of these is true about the changing of one species into another by means of natural selection?

• It happens quickly in just one generation

• It happens slowly in just one generation

• It happens slowly over many generations