Evolution Review

A species is a group of similar organisms that _______

• Can mate with each other and produce fertile offspring.

• Can live together on an island.

• Can migrate to an island from the mainland.

• All have exactly the same traits.

What is the role of genes in evolution?

• Only genes can be acted on by natural selection

• Parents with recessive genes die from overproduction

• The genes of most surviving parents have only dominant alleles

• Only traits that are controlled by genes can be acted on by natural selection

How do scientists determine the actual age of fossils?

• Relative Dating

• Radioactive Dating

• Sedimentary dating

• Mold and cast dating

What did Darwin infer from his observations of organisms in South America and the Galapagos Islands?

• The organisms on the Galapagos Islands were virtually identical to mainland organisms.

• A small number of different plant and animal species had come to the mainland from the Galapagos Islands.

• The organisms on the Galapagos Islands were completely unrelated to mainland organisms.

• A small number of different plant and animal species had come to the Galapagos from the mainland.

Differences between members of the same species are called_______.

• predators

• selections

• variations

• traits

What are fossils?

• The preserved remains or traces of organisms that lived in the past

• mold casts of organisms that live today

• drawings of ancient animals and other organisms

• footprints or burrows of small animals that live today

What is mutation?

• Any change that is harmful to an organism

• Any change that is helpful to an organism

• Any change is a gene or chromosome

• All of the above

Darwin concluded that organisms on the Galapagos Islands__________.

• had changed over time

• had remained the same

• were the result of selective breeding

• had no variations

A gradual change in a species over time is called _________.

• adaptation

• evolution

• variation

• mutation

Factors that control traits are called________.

• purebreds

• recessives

• parents

• genes