Indicate the scenario(s) that could directly result in sympatric speciation. Check all that apply.  

_____  Two sunflower species cross to form a healthy hybrid individual with equal copies of chromosomes from each parental species.
_____  A new river channel divides a population of beetles into two populations.
_____  A large fence blocks the intermingling of two populations of a species.
_____    A subset of flies within a larger population colonizes a new host plant.


Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
 
Gather Content
· What do you already know about sympatric and allopatric speciation?
 
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
 
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?


__X__  Two sunflower species cross to form a healthy hybrid individual with equal copies of chromosomes from each parental species.
_____  A new river channel divides a population of beetles into two populations.
_____  A large fence blocks the intermingling of two populations of a species.
__X__  A subset of flies within a larger population colonizes a new host plant.

Clarify Question
· What is the key concept addressed by the question?
        o This question addresses sympatric speciation.
· What type of thinking is required?
        o This question is asking you to take what you already know and apply it to this unfamiliar situation.
 
Gather Content
· What do you already know about sympatric and allopatric speciation?
        o A population can diverge into two species because the population has been separated geographically – this is allopatric speciation.
        o Or, the population can diverge into separate species even when the populations are not separated – sympatric speciation.
 
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
        o Sympatric speciation can only occur when two populations are reproductively isolated, but not geographically isolated.
        o The two examples here of geographically overlapping populations are the hybridizing sunflower species, and the flies that prefer a new host plant.
 
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
        o The question required you to take what you already know and apply it to this unfamiliar situation.
        o Did you recognize that sympatric speciation occurs when two populations that overlap geographically are reproductively isolated?

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