Question

1. Two bird species have different mating calls, occupydifferent habitats in nature, and when they hybridize, the hybridsare infertile. Which isolating mechanisms maintain thesespecies?

	mechanical isolation, hybrid sterility, geographicalisolation
	ecological isolation, mechanical isolation, hybrid sterility
	geographical isolation, temporal isolation, behavioralisolation
	ecological isolation, behavioral isolation, and hybridsterility

2 IS SKIPPED

3. Species formation among alpine buttercups in New Zealand waspromoted by

	geographical isolation.
	mechanical isolation.
	temporal isolation.
	periodic isolation by glaciation.
	gametic isolation.

4. The model that assumes that evolution proceeds with slowsuccessive change in a given evolutionary line is referred toas

	successive descent model.
	gradualism.
	the allopatric model.
	punctuated equilibrium.
	the sympatric model.

5. In the southeastern U.S., two species of wild lettuce(Lactuca) do not usually form hybrids, because they bloomat different seasons. The means of isolation appears to be

	prezygotic and temporal.
	postzygotic and ecological.
	prezygotic and geographical.
	postzygotic and behavioral.
	prezygotic and mechanical.

6. Males of several marsupial species have forked penises thatare incompatible with female placental mammals. This is an exampleof what type of isolating mechanism?

	mechanical incompatibility
	temporal isolation
	hybrid sterility
	ecological isolation
	prevention of gamete fusion

7. A single seed lands on one of a group of isolated islands.Several million years later, its descendants have evolved into anumber of new species on the different islands, representing avariety of trees, vines, and herbs. At that point in time, we havean example of

	parapatric speciation.
	microevolution.
	adaptive radiation.
	genetic drift.
	mutation.

8. A type of isolating mechanism that leads to reproductiveisolation after a hybrid zygote has formed is called a_____________ isolating mechanism.

	postzygotic
	hybridization
	adaptive
	prezygotic
	differential

9. A virgin pine forest covers a valley, and one of theinhabitants is a red squirrel species. A large volcanic eruptionoccurs and separates the valley with a huge lava flow that thesquirrels cannot cross, thus producing two isolated populations ofsquirrels. What change needs to occur for the two populations ofsquirrels to become separate species?

	The fur color of the two squirrel populations must becomedistinct.
	The two squirrel populations must eat distinct species ofplants.
	The area that the squirrel populations occupy changes so thatthe squirrel populations exist in distinct habitats.
	The two squirrel populations select mates using the same sexualbehavior.
	The two squirrel populations become reproductively isolated.

10. An example of temporal isolation would be

	one plant species is pollinated by bees and a second plantspecies is pollinated by moths.
	one plant species blooms in June-July and a second plant speciesblooms in August-September.
	two plant species live on the same mountainside but one lives onrocky outcrops and the other in open meadows.
	two plant species have incompatible gametes.