Table 1 Students’ mean tree-thinking scores for the clade questions (mean proportion of clades marked correctly across two questions) and evolutionary relatedness questions (mean of accuracy and explanation quality across two questions)
From: Teaching Tree Thinking to College Students: It’s Not as Easy as You Think
| Study 1 | Study 2 | |||
|---|---|---|---|---|
| Tree-thinking skill | Weaker biology background | Stronger biology background | Before instruction | After instruction |
| Nesting of clades | 0.33 | 0.62 | 0.63 | 0.90 |
| Relative evolutionary relatedness—different levels | 0.19 | 0.42 | 0.45 | 0.59 |
| Relative evolutionary relatedness—polytomies | 0.12 | 0.24 | 0.28 | 0.47 |