Key Idea: New species can arise when barriers to reproduction within a population lead to two populations that over time experience different environmental conditions.
Students are expected to know that:
- Speciation begins when barriers to reproduction within a population lead to two reproductively isolated populations whose alleles are no longer mixing.
- Reproductively isolated populations may independently gain or lose alleles through mutation, allele shuffling, and natural selection.
- Over time, reproductive isolation may lead to differences between populations and to new species.
- One way to define species is a group that includes individuals capable of reproducing with each other.
- Because individuals from two different species cannot reproduce with each other, their alleles cannot mix.
| Item ID Number |
Knowledge Being Assessed | Pre-Test | Post-Test (Control) | Post-Test (Treatment) | Select This Item for My Item Bank |
|---|---|---|---|---|---|
59% | 64% | 69% |
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57% | 57% | 65% |
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51% | 67% | 77% |
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50% | 42% | 54% |
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45% | 50% | 55% |
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44% | 66% | 76% |
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43% | 45% | 51% |
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39% | 62% | 67% |
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29% | 39% | 53% |
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29% | 44% | 59% |
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Misconception |
Student Misconception |
Pre-Test | Post-Test (Control) | Post-Test (Treatment) |
|---|---|---|---|---|
59% | 64% | 69% | ||
42% | 28% | 18% | ||
33% | 16% | 15% | ||
19% | 11% | 8% | ||
14% | 13% | 8% | ||
12% | 10% | 5% | ||
Two populations of the same species cannot become two different species. (AAAS Project 2061, n.d.) | 10% | 18% | 19% |
Frequency of selecting a misconception was calculated by dividing the total number of times a misconception was chosen by the number of times it could have been chosen, averaged over the number of students answering the questions within this particular idea.
No NGSS statements are associated with this idea in the selected project.