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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