Change Over Time Review - Clark

The diagram illustrates an embryonic stage of two organisms.Which of the following can be determined by observing the embryos shown in the diagram? 

• The organisms share a common ancestry.
• The organisms belong to the same genus.
• The organisms are native to the same geographic areas.
• The organisms will grow into anatomically similar adults.

Scientists are studying the evolutionary history of a group of plants in the United States, and they developed an evolutionary tree, as shown below.Which statement can be inferred from the evolutionary tree?

• Species 1 is most closely related to Species 8.
• Species 2 is most closely related to Species 3.
• Species 3 is most closely related to Species 7.
• Species 5 is most closely related to Species 6.

Scientists are studying the evolutionary history of a group of plants in the United States, and they developed an evolutionary tree, as shown below.What information about the organisms best helps the scientists to determine the evolutionary relationships among them?

• DNA sequences
•  Anatomical features
• Habitat types
• Reproductive Strategies

Natural selection results in change in a population's _____________ traits over time.

• inherited

• acquired

Over generations of time apart on different islands with different food sources, the separated populations of Galapagos finches accumulated genetic differences until each group had different beaks. This is an example of _____.

• natural selection

• genetic drift

• adaptation

• speciation

Populations undergo evolution NOT individuals! (an individual organism cannot cause change over time in an entire group of organisms)

• True

• False

What is speciation?

• combining of two species to form one with different traits

• Intentional breeding designed to maintain a desired trait

• timing of mating that prevents normal sexual selection

• A population splits and accumulates different genes in the new groups

How does a species change over time?

• by adapting to the environment

• changes in the gene frequencies in a population

• acquiring new traits

• they do not change

The pelvic bone of whales is not needed for movement within the water. This is an example of a(n) ______________ structure.

• vestigial

• analogous

• homologous

The forelimbs of mammals have similar anatomy because these groups descended from a recent common ancestor. Their bone structure is an example of a(n) ______________ structure.

• vestigial

• analogous

• homologous