Climate change and glacial advances during the Pleistocene ice age (2.6 million to 11,700 years ago) split the ranges of several North American bird species into western and eastern populations. The western and eastern populations eventually diverged into two species. What is this an example of? DA. Allopatric speciation following dispersal D B. Allopatric speciation via vicariance O C. Sympatric speciation due to balancing selection DD. Sympatric speciation via autopolyploidy DE. Sympatric speciation via allopolyploidy

Climate change and glacial advances during the Pleistocene ice age (2.6 million to 11,700 years ago) split the ranges of several North American bird species into western and eastern populations. The western and eastern populations eventually diverged into two species. What is this an example of? DA. Allopatric speciation following dispersal D B. Allopatric speciation via vicariance O C. Sympatric speciation due to balancing selection DD. Sympatric speciation via autopolyploidy DE. Sympatric speciation via allopolyploidy

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter20: Speciation And Macroevolution

Section: Chapter Questions

Problem 5TYU: The pupfishes in the Death Valley region are an example of which evolutionary process? (a)...

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Which of the following is NOT true for the speciation of finches in the Galapagos islands? A. Natural selection acted on beak shape, and resulted in different beak morphologies for different food sources. B. Assortative mating reinforced existing divergence between birds. C. Speciation of finches started by birds starting to specialize on different food sources. D. Speciation of finches on the same island is due to allopatric speciation.
Which of the following would result in allopatric speciation by dispersal? A. A river separating a previously contiguous population of salamanders B. A receding water table separating a population of frogs into two separate wetlands C. Finches colonizing an island exposed by water level changes in a reservoir D. A population of trees being split in two by an advancing glacier
How does one species diverge from another? (When do we call a group a new species—and how does that process happen?) Using anole lizards or another very specific example(s), compare and contrast microevolutionary processes with speciation. As you discuss speciation, be sure to compare and contrast sympatric speciation with allopatric speciation and say whether the example you’ve chosen is allopatric or sympatric.
According to the punctuated equilibria model,(A) given enough time, most existing species will branchgradually into new species.(B) most new species accumulate their unique features relatively rapidly as they come into existence, then changelittle for the rest of their duration as a species.(C) most evolution occurs in sympatric populations.(D) speciation is usually due to a single mutation.
If reinforcement is weak and hybrids are not completely infertile, a. genetic divergence between populations may be overcome by gene flow. b. speciation will occur 100% of the time. c. gene flow between populations will be impossible. d. the speciation will be more likely than if hybrids were completely infertile.
A sudden increase in gene flow between two somewhat isolated populations would most likely Group of answer choices a. have no effect on the chance of speciation b. decrease the genetic similarity between the two populations c. increase the chance of speciation d. increase the genetic divergence between the two populations e. decrease the chance of speciation
The first step leading to allopatric speciation is (a) hybrid inviability (b) hybrid breakdown (c) adaptive radiation (d) geographic isolation (e) paedomorphosis
Which of the following is not an event that can contribute to allopatric speciation? a. A mountain range forms and splits two populations into populations that begin to turn into new species. b. A subset of individuals disperse to a far away island and begin to turn into a new species. c. Two populations breed in the same location but at different times, and therefore begin to turn into two new species. d. A river splits a population into two populations and the two populations begin to diverge on either side of the river. e. All of these are potential contributors to allopatric speciation.
In which of the situations below would speciation be most likely to occur? You can choose more than one answer. a. Seven lemurs escape from an enclosure at Duke University. To everyone's surprise, they establish a small but viable population coexisting successfully with humans in a partly suburban environment very different from their native Madagascan habitat. b. Bighorn sheep occupy mountains from Canada to Death Valley in Southern California, interbreeding all along the way. The populations at the two ends of the range live in very different environments. c. A few individuals of a butterfly species were blown to an island during a severe storm. d. A population of juniper shrubs is split by the formation of a canyon. Every year, strong winds carry a small amount of the shrubs' pollen across the canyon.
When the isthmus of Panama (land bridge that connects north and south America) arose about 3 million years ago, it caused species of fish to diverge into sister species located in either the caribean or pacific ocean. Why did they form separate species? A) Because this is an example of sympatric speciation B) Because the tides are different on each side of the land bridge C) Because different predators in each ocean caused the populations to diverge D) Because the populations were reproductively isolated
The difference between sympatric and parapatric speciation is_______ . a. parapatric speciation occurs only in velvet walking worms b. sympatric speciation requires a barrier to gene flow c. the extent of overlap in range d.reproductive isolation does not occur
Imagine a field of monkey flowers. Some of them are pink and others are red. It turns out that the pink flowers are pollinated mostly by bumblebees, whereas the red flowers are pollinated mostly by hummingbirds. As a result pink flowers are fertilized mostly by pollen from other pink flowers, and red flowers are fertilized mostly by pollen from other red flowers. The pink and red flowers have become separate species. What type of speciation is this? Sympatric speciation type (my answer) What mechanism of reproductive isolation was involved? ??