Exam 14: The Origin of Species

Two populations that have been separated by a river are most likely to become separate species if

Which species of wheat shown is polyploid?

Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of

Speciation without geographic isolation is called ________ speciation.

The emergence of many diverse species from a common ancestor is called

Which butterfly has changed gradually but significantly from its ancestor through microevolutionary events that were not part of a speciation event?

Two species that occasionally mate and produce zygotes, but that have incompatible genes that prevent the resulting embryo from developing, are affected by

After reading the paragraph below, answer the questions that follow. In the North Pacific Ocean, two groups of the same species of killer whales (Orcinus orca) appear to be forming two different species based on what they eat. One group eats fish and the other eats mammals such as seals. Scientists can tell what they eat based on their teeth, because whales that feed on fish have significantly different wear patterns. -Which of the following describes the type of speciation event that is occurring in these whales?

Which of the following descriptions best represents the gradual model of speciation?

Allopatric speciation is not likely to occur when

When a tetraploid flower pollinates a diploid flower of the parental species, the resulting offspring will be

Which of the following types of reproductive barriers separates a pair of insect species that could interbreed but for the fact that one lives on goldenrod plants and the other on autumn daisies in the same general area?

Which of the following statements about the Galápagos finches is false?

After reading the paragraph below, answer the questions that follow. In the North Pacific Ocean, two groups of the same species of killer whales (Orcinus orca) appear to be forming two different species based on what they eat. One group eats fish and the other eats mammals such as seals. Scientists can tell what they eat based on their teeth, because whales that feed on fish have significantly different wear patterns. -Which of the following would not be a useful procedure to perform in determining whether or not this speciation has occurred?

The fossil record shows that for many plant and animal groups, the time between speciation events

A group of ants escaped from a picnic basket carried to the top of a mountain and thrived in this area where there were no other ants. Many years later descendants of these ants crawled into a picnic basket on the mountain and traveled back to the valley from which their ancestors had come. Which of these observations would cause you to conclude that the ants on top of the mountain had become a different species from those in the valley?

Which of the following would tend to promote adaptive radiation?

In which of the following situations would speciation be most likely to occur?

Which of the following statements regarding the definition of species is false?

Frequently, a group of related species will each have a unique courtship ritual that must be performed correctly for both partners to be willing to mate. Such a ritual constitutes a ________ ________ reproductive barrier.