In the presence of a chromogenic substrate,wh | vedclass

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(B) The process of insertional inactivation is used to distinguish recombinants from non-recombinants. When a foreign $DNA$ fragment is inserted into

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Colorless colonies and blue colonies

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(B) The process of insertional inactivation is used to distinguish recombinants from non-recombinants. When a foreign $DNA$ fragment is inserted into the $\beta$-galactosidase gene,the enzyme is inactivated. Non-recombinant bacteria contain the functional $\beta$-galactosidase gene,which acts on the chromogenic substrate ($X$-gal) to produce blue-colored colonies. Recombinant bacteria,where the gene is interrupted by the foreign $DNA$,cannot produce the functional enzyme and therefore produce white (colorless) colonies in the presence of the chromogenic substrate.

In the presence of a chromogenic substrate,what color colonies do recombinants and non-recombinants produce,respectively?

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