Exam 16: The Origin of Species

A plant breeder can use plum pollen to hand-fertilize an apricot flower. The fruit contains fertile seed that grows into a hybrid called a plucot. However, in the natural environment, plums and apricots bloom several weeks apart. Why are plums and apricots considered separate species?

The biological species concept cannot be applied to:

Store-bought hybrid tomatoes are very popular with consumers. Suppose you buy a tomato from the grocery store, collect seeds from it, and plant the seeds. If the seeds do not germinate, the seedlings fail to thrive, or the plants die quickly after sprouting, what reproductive isolating mechanism might be responsible?

What events may push a species to extinction?

The behavior shown in the photograph is a component of:

Hybridization may lead to the extinction of a species because:

Where would a researcher most likely find examples of allopatric speciation?

Two populations of flowers look identical but are pollinated by different pollinatorsone by a night-flying hummingbird moth, the other by honeybees. These two flowers represent:

What are the five premating isolating mechanisms that keep different species from successfully mating?

The most common cause of extinction is:

Hybrid inviability occurs when two species mate and produce fertile offspring able to move into new habitats. True or False?

Two species of snails are physically unable to mate. This is an example of:

When a species invades a new habitat and evolves rapidly into several new species to better exploit new resources, what has occurred?

One species of moss in upstate New York produces gametes in May, and another species of moss in the same region produces gametes in June. This is an example of a ________ isolating mechanism.

The biological concept of species requires that:

In many species of fireflies, males flash light from their abdomens to attract females. Each species has a different flashing pattern. This is an example of:

When the pollen of one plant species will not germinate on the flower of another species, it is an example of:

Ligers, the offspring from the mating of a lion and a tiger, are sterile. This is an example of:

In the late 1700s, two populations of minnows became isolated when an earthquake altered the path of a river. Now the populations can no longer successfully breed with each other even when they are both moved to a new pond. These organisms have undergone ________ speciation.

Two organisms that live on different islands are experiencing ________ isolation.