Natural Selection And Evolution

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

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

What will most likely happen to the population of moths in this habitat?

A biology teacher asks students to give examples of genetic variations that support the idea that changes in a population's environment affect genetic variation. Which is the least supportive example?

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?

Which statement is a valid claim that could be made using the data in the graph?

Which of the following best defines a gene pool?

Henry was studying two populations of the same species of lizards. One population lived on an island and the other lived on the mainland. Both populations were affected by a hurricane that hit the island and the mainland with equal force. A year later, Henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. Which best describes a conclusion he might have reached?

Changes in the gene pool can occur due to various mechanisms. From 1892 to 1954, millions of individuals emigrated (moved out) from countries across the Atlantic Ocean to the United States. Many of these individuals entered through Ellis Island, a federal immigration station in New York. Which mechanism affected the gene pool of the immigrants that entered the United States through Ellis Island?

In Wisconsin, a very large population of lake trout, in which individuals mate at random, experiences no migration, mutations, nor selective pressure for a number of years. Which of these is most likely to occur in the population?

A population of pigs lives on an island together with burrowing termites. Pigs that have the longest snouts tend to survive better. 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?

Genetic drift in a population affects the gene pool in which of the following ways?

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?

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?

Which process drives Darwin's theory of evolution?

Environmental factors can influence natural selection because they can increase or decrease

A population that is becoming less diverse because of its individuals tending to be larger is most likely experiencing [___________] selection.

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 describes the effect of this environmental change?

Which of the following best defines gene flow?

Which environmental factor could lead to a decrease in genetic variation in a population of tuna?

In a population of seals, most of the seals have similar coloring. However, one seal has albinism. This seal is white and is almost completely blind. What is most likely the cause of this difference from the rest of the population?

Your teacher describes a population of fish that live in a coral reef. Some fish are dark orange (the same color as the coral); other fish are 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?

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?

Which of the following is least likely to change the gene pool of a population of chipmunks?

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

Which of the following is the definition for speciation?

Which is the best definition of directional selection?