Edvotek® Blue/White Cloning of a DNA Fragment & β‑Galactosidase Assay (80230)

The Edvotek® Blue/White Cloning of a DNA Fragment experiment provides students with a comprehensive introduction to recombinant DNA technology and one of the most widely used screening methods in molecular biology. This hands‑on laboratory activity demonstrates how insertion of a DNA fragment into a plasmid can disrupt β‑galactosidase production, allowing recombinant colonies to be easily identified.

In this experiment, a provided DNA fragment is ligated into a linearised pUC‑based plasmid using T4 DNA ligase. When the DNA is successfully inserted into the plasmid’s polylinker region, β‑galactosidase activity is interrupted. Following transformation of competent E. coli cells, students plate the bacteria on selective media containing X‑Gal and antibiotics. Recombinant cells form white colonies, while non‑recombinant cells form blue colonies.

Students then extend their investigation by performing a β‑galactosidase activity assay on both blue and white colonies, reinforcing the link between genotype and phenotype. This experiment can be completed as a full workflow or divided into three flexible modules: plasmid ligation, bacterial transformation, and enzymatic assay.

This experiment corresponds to Edvotek Experiment 300 and is intended exclusively for educational use, providing a safe and structured introduction to molecular cloning techniques used in research and biotechnology.

Key Features

• Classic blue/white screening for recombinant DNA identification
• Uses plasmid ligation with T4 DNA ligase
• Transformation of competent E. coli cells
• Visual differentiation of recombinant (white) and non‑recombinant (blue) colonies
• Includes β‑galactosidase enzyme activity assay
• Can be delivered as three stand‑alone modules
• Closely models real‑world genetic engineering workflows

Ideal for School Science Lessons

Ideal for A‑Level Biology, Applied Science, and introductory undergraduate biotechnology, this experiment supports teaching topics such as gene cloning, plasmids, enzymes, transformation, and gene expression. The clear visual outcomes make complex molecular processes accessible and engaging for students.

• Teaching how recombinant plasmids are created and identified
• Exploring the relationship between DNA insertion and gene expression
• Demonstrating the use of antibiotic selection and reporter genes
• Developing practical skills in molecular biology techniques
• Preparing students for advanced study in genetics and biotechnology

Engaging, flexible, and highly illustrative, the Edvotek® Blue/White Cloning experiment gives students an authentic insight into the techniques that underpin modern genetic engineering, reinforcing theoretical learning through hands‑on laboratory experience.