Question

In blue/white screening, the transformed cells with rDNA will exhibit

• A. blue colour
• B. white colour
• C. blue and white colour
• D. no colonies

Answer 1

The correct option is B white colour

In blue/white screening, the transformed cells with rDNA will show white colour. The untransformed cells contain the lac Z gene which gives blue colour in medium containing X-gal. Whereas, the transformed cells contain inactive lac-Z gene which gives white colour.