Semester 1 Final Review

Which is the newest trait?

• Amniotic egg

• Walking legs

• Jaws

• Hair

You look at two species and see very similar amino acid sequences. What does this likely tell you?

• These are the same animal.
• These animals have a common ancestor.
• These animals are not likely related.
• These animals are likely becoming one species.

Which group of animals on this tree are most closely related to birds?

• Saurischian dinosaurs

• Ornithischian dinosaurs

• Crocodiles

• None of these are related to birds

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

Genetic drift is change in the allele frequency of a population due to...

• random chance
• natural selection
• non-random mating (sexual selection)
• artificial selection

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

Many different groups of organisms have wings, even though they do not share a recent common ancestor. This is because they evolved in environments with similar selective pressures. Wings are an example of a(n) ______________ structure.

• vestigial

• analogous

• homologous

A flood drowns a large portion of an insect population, with only a few random individuals surviving. This is an example of ______.

• genetic drift

• adaptation

• natural selection

. Which of the following is an example of primary succession?

• A.lichens growing on rocks following a volcanic eruption

• B.grasses growing after a forest fire

• C.oak trees replacing pine trees in a forest

• D. non-native species introduced into a climax community