Discover Biology Study Set 1

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?

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

Individuals of the same species generally

Two species live in the same area but breed in different parts of their habitat.These species are

Which of the following is an example of a postzygotic barrier?

Which of the following is NOT an example of a prezygotic barrier?

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

Which of the following is an example of reproductive isolation?

Before the cultivation of the apple tree,apple maggot flies laid their eggs exclusively on the fruit of Hawthorne trees.As apple orchards became more prominent,apple maggot flies began to lay their eggs on both the fruit of the Hawthorne tree and the fruit of cultivated apple trees.Now,apple maggot flies that live on apple trees mate and lay their eggs at different times of the year than apple maggot flies that live on Hawthorne trees.Is this an example of reproductive isolation?

Which of the following is an example of a prezygotic barrier that can isolate two species living in the same geographic area?

Because alleles are only exchanged within species,each species is said to have a unique

Using reproductive isolation as a method of defining a species is NOT useful for

The distance needed for geographic isolation is

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

Why have the two plant populations depicted in the following diagram become so different in the time they were separated by the ocean?

In the following figure,two populations of one species of fruit flies were raised for several generations on different nutrients (starch and maltose).Then the members of the two populations were reintroduced and the mating frequencies of flies from the two different populations were recorded.Which of the following is true?

Populations within a species are connected by

For two populations to accumulate enough genetic differences to cause speciation,the factors that promote these differences

Speciation

Geographic isolation limits the ________ between populations of a species.