According to the punctuated equilibrium model of evolution, __________.

In a hybrid zone, which of the following would tend to lead to reinforcement?

In the Lake Victoria cichlids, what appears to be contributing to fusion of different species?

What is the first thing that must happen in order for speciation to occur?

Comparison of human fossils with living humans seems to show that there have been no significant physical changes in Homo sapiens in 30,000 to 50,000 years. What might an advocate of punctuated equilibrium say about this?

Define 'biological species.'

Name the two types of speciation represented by this diagram. For each type, describe how reproductive barriers may develop between the new species.

What distinguishes a morphospecies?a. It has distinctive characteristics, such as size, shape, or coloration.b. It represents a distinct branch in a phylogeny of populations.c. It is reproductively isolated from other species.d. It is a fossil from a distinct time in Earth history.

Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals. These rituals involve fighting other males and making stylized movements that attract females. What type of reproductive isolation does this represent?a. habitat isolationb. temporal isolationc. behavioral isolationd. gametic isolation