Exam 15: The Origin of Species

Currently,the biggest factor having an effect on polar bear evolution is

The death of zygotes produced by the mating of individuals of two different populations is an example of how ________ barriers can lead to reproductive isolation.

The willow flycatcher and the least flycatcher are similar in appearance,and in many regions of the United States,their ranges overlap.The two organisms do not interbreed.Based on this information,willow flycatchers and least flycatchers are

Vertebrates,animals with backbones,and arthropods,including insects,are only distantly related.The arthropod eye evolved independently of the vertebrate eye.Therefore,the arthropod eye and the vertebrate eye are ________ structures in relation to each other.

The primary difference between the prezygotic barriers and postzygotic barriers involved in reproductive isolation is that prezygotic barriers

In the following illustration of adaptive radiation of mammals,which is the ancestral species?

Evidence suggests that Neanderthals and humans are the same species.

Terrestrial plants radiated onto land because of a mass extinction.

Which of the following must take place for speciation to occur?

Hair is an analogous feature in the different mammal species.

The fossils of two adult birds are found in a nest containing several fossilized eggs.Physically,the bird fossils look very different from each other.What are scientists most likely to use to classify these species?

Vestigial organs had a function in a previous ancestor but no longer have a function in the current species.

Speciation cannot occur without geographic isolation.

Which of the following does NOT contribute to the biodiversity seen on islands?

Geographic isolation limits the ________ between populations of a species.

________ barriers cause speciation to occur by preventing fertilization when two individuals of different populations attempt to mate.