Unit Test Answers

A student has written a paper about a deer population that was separated when a canyon developed between members of the group. In her paper, she showed that the two groups adapted differently and can no longer interbreed. What would be the best title for her paper?

Jezelyn needs to create a project that shows geographic isolation in action and decides to make a video. Which of the following would make the best project?

Babies with very low or very high birth weight are less likely to survive. The graph shows the percentage of babies born at different weights.Which statement is a valid claim that could be made using the data in the graph?

Which type of selection leads to increased phenotypic and genetic variation?

A scientist wrote a paper titled “Directional Selection in Action” after observing a population of mice for 15 years. The mice typically preferred to eat berries, although a few would also eat insects. After a drought in year 3, the scientist observed that more mice were eating insects. By year 10, most of the mice in the population ate insects in addition to berries. Which best describes her article?

Stick insects, also called walking sticks, are typically found in tropical and subtropical forests and grasslands. The insects are able to camouflage themselves by living among twigs in their environment.What is this an example of?

Which process drives Darwin’s theory of evolution?

Which of the following is the definition for speciation?

A population of pigs lives on an island together with burrowing termites. Pigs that have the longest snouts tend to survive more frequently than those with shorter snouts. Over time, most of the pig population is made up of individuals that have very long snouts. This is an example of which type of selection?

A population contains short plants and tall plants. The short plants are not able to compete with tall plants for sunlight. The tall plants, however, are more susceptible to wind damage. Which type of selection will this population of plants most likely experience?

A population of squirrels lived together in a forest. An event occurred that caused the population to diverge into two different species over a long period of time. Which of the following is most likely the event that occurred?

Which type of selection occurs when a population experiences a shift in diversity toward the larger organisms?

Which of the following can result in a population looking more similar over time and can be described as selection against both extremes of a trait?

Your teacher describes a population of fish that live in a coral reef. Some fish are dark orange (the same color as the coral). Some fish are nearly white. Most of the fish exhibit a color between dark orange and nearly white. Human activity has led to the bleaching of the coral reefs, making them very pale in color. Over time, the population of fish will be affected. Which graph represents the type of selection that you expect to occur?

A population of chimpanzees was separated when the forest that they lived in had a section cut down and a town was built. After a long period of time, the chimpanzees came back into contact but were incapable of breeding. Which of the following best describes the process that occurred?

Which is the best definition of directional selection?

Imagine a population of rabbits with fur color that ranges from black to white. If this population were put in an area that has dark rocks that camouflage the black rabbits, as well as light stones that hide the white rabbits, what would most likely happen to the gray rabbits?

Which graph represents selection that may lead to reduced variation in a population?

In a bird population, 50 % of the individuals had white feathers, and 50% had colored feathers. Over time, it was observed that 98% of the population had colorful feathers. The rest had white feathers. How did the type of selection in this example affect the population’s biodiversity?

Two insect groups vary genetically by two genes. When put together, they were able to reproduce and produce offspring that could also breed. Which best describes this insect population?

Which organisms are most likely to survive in a population in which disruptive selection is occurring?