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- 1. Multiple Choice
Why does evolution by means of natural selection act at the population level and not at the individual level?
Individuals cannot change inheritable traits.
Environmental selective pressures only affect groups of individuals and not the individuals themselves.
There are usually no significant differences between the individuals of a population.
Mutations occur so rarely that they are detectable only at the population level.
- 2. Multiple Choice
Which correctly identifies how natural selection causes a change in species over time?
People choose mating pairs based on desirable characteristics.
The environment favors those individuals with the best phenotypes for survival.
If an anatomical feature is not used for several generations, offspring will cease to inherit that trait.
There is a trend towards homozygous dominant genotypes becoming the most common in the population.
- 3. Multiple Choice
The graph indicates the changes over time in a particular trait in a population of shrew. Which statement best explains what occurred after 10 years?
A mutation in the shrew population made the trait more common.
Inheritance of the trait slowed as the population of shrews decreased.
The shrew population began breeding with a different shrew species.
An environmental change favored the trait for selection within the population.
- 4. Multiple Choice
Members of a population may become two different species over time. In which situation is speciation most likely to occur?
A large number of the population is exposed to a viral infection.
A few members of the population develop mutations in somatic cells.
A large number of the population migrates over a great distance.
A few members of the population are isolated from the others.
- 5. Multiple Choice
A crop is treated with a pesticide and 98% of the insects are killed. What will most likely happen to the remaining insects?
They will migrate to another area.
They will reproduce and pass on resistant genes.
They will die off due to a decrease in their population size.
They will mate with a different species of insect to ensure survival.
- 6. Multiple Choice
How does the genetic disorder sickle cell anemia cause evolution by natural selection?
Sickle cell restricts participation in certain athletic events.
Sickle cell is found in many locations around the globe.
Sickle cell causes extreme disease in persons who live at high
altitudes.
Sickle cell promotes resistance to malaria and as a result, it was how this trait increased in certain populations.
- 7. Multiple Choice
Which characteristic of mitochondria and chloroplasts led scientists to believe that the two organelles evolved through the symbiotic relationship between two prokaryotic organisms?
the presence of a cell wall
the development of bilayer membranes
the presence of their own internal organelles
the ability to store energy directly from the sun
- 8. Multiple Choice
Which cellular organelle is thought to have evolved from a prokaryote that was able to use oxygen?
Chloroplast
Mitochondria
Golgi Body
Nucleus
- 9. Multiple Choice
Which would most likely be biochemical evidence of evolution? (Hint: You can't physically see chemicals.)
Chimpanzees and humans have a similar gene for producing
hemoglobin.
Fish, bird, rabbit, and human embryos all have gill slits and tails.
Humans, whales, and bats all have similar looking forelimbs.
Digestion in all organisms follows a very similar pathway.
- 10. Multiple Choice
Which organisms are most closely related?
Organisms with 0% similar amino acid sequences.
Organisms with 10% similar amino acid sequences.
Organisms with 35% similar amino acid sequences.
Organisms with 60% similar amino acid sequences.
- 11. Multiple Choice
Which best explains why antibiotics lose their effectiveness over a period of years?
Antibiotics break down very quickly when digested in the body.
Antibiotics can kill bacteria only within the first few hours of illness.
Antibiotics are effective at first but become weak before killing off harmful bacteria.
Antibiotics are effective at killing some bacteria, but the
resistant bacteria survive and reproduce.
- 12. Multiple Choice
Why is variation among members of a species is important?
Variation ensures high levels of competition.
Variation increases the available ecosystem resources.
Variation ensures the variety of reproductive methods for a species.
Variation increases the chances of survival under changing conditions.
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