Bio 117 Quiz 2

Which of the following does NOT tend to promote speciation?

gene flow

Which species concept would be most useful to a team of biology students conducting a biodiversity survey on their campus?

The morphospecies concept

On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences. Which two of the following have operated to increase divergence between mosquitofish populations on Andros?

3. sexual selection 5. natural selection

Which mechanism of reproductive isolation causes postzygotic isolation?

Hybrid sterility

Which of the following describes dispersal?

Individuals colonize a novel habitat.

If asked to join a science panel to speak to Congress, could you explain how this fragmentation process could lead to extinction?

Species can dwindle to extinction due to inbreeding. Species can dwindle to extinction due to loss of genetic variation. Species can dwindle to extinction due to catastrophes.

Evaluate this statement: Gene flow increases the genetic divergence of populations.

This statement is false. Gene flow reduces the divergence of populations.

Human populations are not considered separate species under the biological species concept because Different populations of humans are not different species according to the morphological species concept because Nor are human populations separate species under the phylogenetic species concept because

all human populations can successfully interbreed they have virtually identical anatomy and physiology they all rose from a very recent common ancestor and cluster together as one branch

Which of the following groups could be identified using the biological species concept? extinct dinosaurs bacteria living today. lizard species living today. sunflower species living today

lizard species living today. sunflower species living today

How could fragmentation lead to speciation?

via allopatric speciation