Explanation:

Bird wings and bat wings developed independently that one another, as they execute not re-publishing a typical ancestor through wings, thus this is convergent evolution.

You are watching: What is the most likely explanation for how speciation occurs?

Divergent evolution implies a common ancestor native which different traits arise, so the is incorrect. It is not homology, as homology defines structures the are comparable due come a usual ancestry. Allopatric speciation is the appearance of new species because of a geographical barrier. Genetic drift is random variation in population genetic structure of a solitary species, which is unrelated to the topic at hand.


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Example concern #1 : understanding Sympatric and also Allopatric Speciation


A physical barrier separates a solitary species, bring about two separate populations to form. With time these two populaces adapt to their environments. Eventually, this two populaces are no longer able to properly reproduce with each other. This is well-known as __________.


Possible Answers:

peripatric speciation


allopatric speciation


parapatric speciation


sympatric speciation


Correct answer:

allopatric speciation


Explanation:

Allopatric speciation describes the process by i m sorry a physical barrier separates a single population, bring about two (or more) populaces to arise and also evolve as result of environmental distinctions to come to be different species. Examples of factors that deserve to lead come allopatric speciation encompass island formation, canyon and valley formation, and also river paths.


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Example inquiry #1 : expertise Sympatric and also Allopatric Speciation


Which script is an example of allopatric speciation?


Possible Answers:

Houseflies native a certain region migrate and interbreed v a different housefly populace in a surrounding area


Certain members of a human population have an ext offspring than others


A an illness ravages a huge fox population, killing every members the did not have a hereditary resistance come the disease


Hawks with thin, sharp beaks mainly eat fish and little rodents, while hawks with bigger beaks tend to eat reptiles and also larger birds


A flow separates members the a squirrel population that offered to occupy the same geographical area


Correct answer:

A river separates members of a squirrel population that supplied to occupy the exact same geographical area


Explanation:

Allopatric speciation occurs as soon as a geographical barrier, like a river, mountain, or canyon, the end members of a population. This barrier prevents the people on one next from reproducing v the people on the other. In addition, picking forces may act differently on the two sides that the barrier. This separation ultimately results in two distinctive species.

Here, the only instance of allopatric speciation is that regarding the 설 설 separated by the river. The example with the hawks describes sympatric speciation, where no geographical barrier exists, yet speciation deserve to still occur as result of other stressors. The remaining choices do not define speciation in ~ all.


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Example inquiry #4 : understanding Sympatric and also Allopatric Speciation


Which that the complying with reasons could explain why sympatric speciation is an ext common in plants 보다 in animals?


Possible Answers:

Plants are more likely to have the ability to self-fertilize 


Plants can become geographically isolated more easily


Animal populaces move around too much


Plants are less prone to chromosomal abnormalities 


Correct answer:

Plants are an ext likely to be able to self-fertilize 


Explanation:

Sympatric speciation implies a speciation occasion while the populaces exist within the very same geographical region.

Animals moving around an ext often does not really define why speciation would happen differently, and also plants space not necessarily less prone come chromosomal abnormalities. In fact, tree are much more likely to be able to reproduce after abnormal chromosomal inheritance (nondisjunction, polyploidy, etc.) because many can self-fertilize. Rather of wandering around to find a mate, the plant have the right to reproduce through itself and also potentially create a reproductively secluded species.


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Example question #5 : expertise Sympatric and Allopatric Speciation


Which the the adhering to would it is in considered an instance of problems leading come allopatric speciation?


Possible Answers:

Combat among males to display superiority for mating v females


Females selecting mates based upon courtship displays


Separation the a population of lake fish by a drought resulting in a sand bar splitting the lake


A differentiation in wanted food resource by members that a populace within a given habitat


Correct answer:

Separation that a populace of lake fish through a drought bring about a sand bar splitting the lake


Explanation:

Allopatric speciation outcomes in the development of a new species based upon geographic separation the a population from its parental population. Geographic separation significantly restricts gene flow and, together a result of the isolation, various other reproductive barriers may arise indigenous the parent/ancestral species. Once reproductive barriers emerge in the allopatric population the capacity to interbreed v the parent populace may be prevented or extremely impaired, even if the two populations were come come earlier into contact.

The various other answer choices are components of sympatric speciation, in which a populace can provide rise to a brand-new species without geographical isolation.


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Example question #6 : knowledge Sympatric and also Allopatric Speciation


What is required for sympatric speciation to occur?


Possible Answers:

Emergence the a reproductive barrier


Geographic separation that a population


A limited separation that members that a population, adhered to by reintroduction back into the parental population


Continuous gene flow between populations


Correct answer:

Emergence the a reproductive barrier


Explanation:

Sympatric speciation describes the evolution of a brand-new species indigenous a parent populace without geographic isolation. The aberration into a brand-new species needs the formation of a reproductive obstacle that isolates a subset that the populace from the rest, thereby blocking gene flow.

The development of a reproductive barrier can result from polyploidy or natural selection. If a subset the a population chooses to just eat fruit that have fallen from trees while the remainder climb the tree to eat, then the subset may eventually evolve various traits. Polyploidy creates a unique genetic difference in between individuals and also can command to distinction phenotypes and reproductive barriers.


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Example concern #7 : understanding Sympatric and Allopatric Speciation


Which of these animals would it is in least likely to experience allopatric speciation?


Possible Answers:

Raccoon


Snake


Bird


Prehistoric human


E. Coli


Correct answer:

Bird


Explanation:

Allopatric speciation occurs as soon as two teams of organisms room separated by a physical or geographic barrier. Common examples that these obstacles include mountain ranges, oceans, and also even big rivers. The isthmus of Panama is a prime example of a geographical barrier and it separates the Atlantic and Pacific oceans. 

Certain barriers are more easily traversed through some animals than others. Because that instance, an animal such together a cat is an ext likely to it is in corralled by a river than a horse or dog since the last two are known to swim an ext often. Yet a river poses no danger of isolation to a bird. Due to the fact that of their setting of locomotion birds are least likely to be hindered through a geographical obstacle than a snake, raccoon, or also a prehistoric human (modern globalization almost entirely eliminates human"s vulnerability to allopatric speciation).


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Example concern #8 : understanding Sympatric and Allopatric Speciation


One varieties of organisms living in the exact same valley start to diverge from each other over time and also eventually two distinct varieties emerge the no much longer mate with members that the other group. What form of speciation is this?


Possible Answers:

Sympathetic speciation


None of these - this is not an example of speciation


Sympatric speciation


Allopatric speciation


Allosteric speciation


Correct answer:

Sympatric speciation


Explanation:

Sympatric speciation occurs when a species of organisms becomes two different species whilst inhabiting the same area. Geographic obstacles do no play a duty in their aberration from one another. Allopatric speciation occurs due to the fact that of a geographical barrier such as a mountain range. Sorry is not an evolutionary term and also allosteric ad to specific sites on molecule in molecule biology and biochemistry.


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Example question #9 : expertise Sympatric and also Allopatric Speciation


Which that the following ideal describes the early speciation event in allopatric speciation?


Possible Answers:

Genetic polymorphism


Geographic isolation


Isolated niche population


Partially isolated population


Correct answer:

Geographic isolation


Explanation:

Allopatric speciation occurs once one populace separates right into two geographically diverted populations. The geographic isolation prevents gene transfer and also reproduction, allowing for hereditary divergence between the two populations.


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Example question #10 : understanding Sympatric and Allopatric Speciation


Peripatric speciation is a subgroup of i beg your pardon of the following species of speciation?


Possible Answers:

Sympatric


Peripatric


Allopatric


Parapatric


Correct answer:

Allopatric


Explanation:

Peripatric speciation is a subgroup of allopatric speciation. In instances of peripatric speciation, a small section of the population becomes genetically isolated from the main population; therefore, it becomes genetically distinct. An instance of peripatric speciation is the founder effect.


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