If alien DNA is inserted within the coding sequence of enzyme $β$ -galactosidase, which of the following will occur in case of non-recombinants?

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Enzyme $β$ -galactosidase will not form

Chromogenic substrate gives blue colour

Insertional inactivation of gene coding for $β$ -galactosidase

No colour is produced by the colonies

answer is C.

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Detailed Solution

In non-recombinants, alien DNA is not inserted in the sequence of enzyme $β$ -galactosidase. So, the enzyme will produce blue colour on addition of chromogenic substrate.

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