Exact(4)
Improvements to address drift in the POF are also presented.
Even though questions from both data sets specifically asked students to define genetic drift, 31.5% (n = 112) of responses failed to address drift at all (Table 2).
The number of responses that did not address drift was significantly different before and after instruction (Fisher's test, p < 0.0001; Table 2), suggesting that students in these courses did not address drift before instruction because they had little or no knowledge of the concept.
We predicted that 1) the number of students who did not address drift, 2) the number of responses that indicated some knowledge of the definition of genetic drift, and 3) the number of responses containing at least one misconception would all be different before and after instruction.
Similar(56)
Among responses that addressed drift (n = 244), only 11.5% (n = 28) indicated some knowledge of the definition of genetic drift.
Overall, 83.2% (n = 203) of the responses that addressed drift contained at least one misconception (Table 2).
Within the overarching categories of misconceptions, we have listed misconceptions in decreasing order from highest to lowest percentage of responses that addressed drift (Table 3).
To test our second and third predictions, we examined only the responses from the case study data set in which students addressed drift (n = 207).
In responses that addressed drift (n = 244), we identified five overarching categories of misconceptions: Novice Genetics, Novice Evolution, Associating Genetic Drift with Other Evolutionary Mechanisms, Associating Genetic Drift with Population Boundaries, and Developing Genetic Drift Comprehension.
"I think Belmont broke through this invisible barrier in the sense that it addressed drifting smoke in housing as a public health issue," said Serena Chen, the regional director of policy and tobacco programs for the American Lung Association of California.
At this preliminary stage, we identified three general types of student responses: responses that did not address genetic drift, despite explicit instructions to do so; responses containing misconceptions about genetic drift; and responses indicating at least some knowledge of genetic drift.
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