Randomized Controlled Trial of a Cohesive Eight-Week Evolution Unit That Incorporates Molecular Genetics and...

Area of Science:

• Molecular genetics
• Evolutionary biology
• Science education

Background:

• Next Generation Science Standards (NGSS) emphasize integrating molecular genetics and evolution.
• Curricular materials are needed to support this integration in high school biology.

Purpose of the Study:

• To develop and test the "Evolution: DNA and the Unity of Life" curricular unit.
• To assess the impact of the unit on student understanding of evolution and molecular genetics.
• To evaluate student engagement in scientific argumentation and data analysis.

Main Methods:

• Randomized controlled trial involving 38 teachers and 2269 students.
• Comparison between the GSLC curriculum and typical NGSS-friendly units without molecular genetics.
• Pre/post gain scores and teacher implementation data were collected.

Main Results:

• Students using the GSLC curriculum demonstrated significantly greater gains in understanding evolution.
• A moderate effect size was observed for student learning outcomes.
• Students in the treatment group had increased opportunities for argumentation and in-class discussions.

Conclusions:

• The "Evolution: DNA and the Unity of Life" unit effectively enhances student comprehension of evolution and molecular genetics.
• The curriculum supports NGSS-aligned practices like argumentation and data analysis.
• Findings have implications for secondary and postsecondary science education reform.