Exam 20: Origin of Species and Macroevolution

You discover a new species of lily that has 10 chromosomes (2n=10).Genetic testing reveals that it arose from the interbreeding of two other species of lilies,one of which has 12 chromosomes (2n=12),and one of which has 8 chromosomes (2n=8).What is the correct term for the new lily species?

Sympatric speciation differs from allopatric speciation because in sympatric speciation

During spring time in Maine,male moose often enter a cow pasture and begin calling to the female cows.The moose may even try to mount the female but the male moose genitalia do not fit properly inside the female cow genitalia.This is an example of

Two species of three-spined stickleback fish live in a single lake in British Columbia.They are closely related but occupy different niches.They exist nowhere else.These species most likely arose by sympatric speciation from a single species of three-spined stickleback.

Some breeds of dogs that are specialized to retrieve objects from bodies of water have webbing between their toes,while most other breeds do not have webbing.Variation in what cellular process is most likely responsible for this difference?

What mechanism makes it difficult to classify bacteria into distinct species groups?

A storm blows a small group of migrating birds off course and they land on an island,where they remain for 100 generations.At this time,a second storm brings more birds from the mainland population to the island.These new birds cannot mate with the established birds,even though they are originally from the same population.What mechanisms are likely to have been involved in bringing about this speciation? Select all that apply.

Which gene is correctly matched with its evolutionary significance?

Sperm from a slate-pencil sea urchin are moved by the ocean currents towards eggs from a rock boring sea urchin.The rock boring urchin eggs are fertilized,but only complete the first three rounds of embryonic cell division.What type of reproductive isolation is at work in this example?

The phenomenon in which one region of the body grows faster than another among different species is called

Approximately 3.5 million years ago the Isthmus of Panama formed.This new landmass severed the connection between the Pacific Ocean and the Caribbean Sea.An ancestral fish population (porkfish)was split in two by this event;the two populations no longer interbreed and are two distinct species.This type of speciation is called

Under the ___________ ,species are identified based on their unique habitat requirements.

The process of evolutionary changes that result in formation of new species is called

A liger is the offspring of a male lion and a female tiger.Male ligers cannot produce offspring.This is an example of

Dandelions,Taraxacum officinale,are plants that asexually produce fruitlike propagules.Sexual reproduction is very rare in this organism.Which species concept would be least useful in defining dandelions as a species?