Front

An adaptation is

Back

a trait that helps an organism survive in its environment.

Front

Genetic diversity is ultimately/mainly the result of

Back

mutations.

Front

Which of the following is not an example of evolution?

• Horses becoming taller and faster over millions of years.
• All species of tortoises in the Galapagos islands descending from a common ancestor.
• Human brains becoming larger over time.
• A caterpillar going through a change into a butterfly.

Back

A caterpillar going through a change into a butterfly.

Front

Which of the following does NOT increase genetic variation? Mutations, Gene flow, Mitosis, Crossing over

Back

Mitosis

Front

A population of bacteria is treated with hand sanitizer. Because of genetic variation in the population, what is a possible outcome?

Back

Some may be resistant and survive.

Front

Process where organisms with certain traits survive and reproduce better than others.

Back

natural selection.

Front

Genes for traits that help an organism be more successful reproductively can be expected to

Back

become more common in the future.

Front

During a period of droughts in the Mojave Desert, seeds that are small and easily eaten become more and more rare, leaving mostly seeds that are large with hard-cased shells behind. The only birds that can eat these particular seeds are those with large beaks. If the drought continues for several more years, what should be expected to happen as a result of natural selection?

Back

More small-beaked birds will die than larger-beaked birds. The offspring produced in the following generations will have a higher percentage of birds with larger beaks.

Front

Which of the following is not a principle of natural selection?

Back

Evolution will occur as an organism gets older and learns more.

Front

Natural selection results in change over time by acting on traits that are ___________.

Back

heritable