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Question

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

A
blue colour
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B
white colour
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C
blue and white colour
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D
no colonies
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Solution

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.

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