the lacZ gene encodes b-galactosidase, a key enzyme in lactose
metabolism. Which lactose is present in the cell, the cell
expresses lacZ and metabolizes lactose.
source (Matseringbiology.com and campbell biology)
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a gene is now defined as a region of DNA that can be expressed
to produce a final functional product that is either a polypeptide
or an RNA molecule. The reason for the change is that our
definition before was too simple as it was (a gene codes for a
polypeptide). check it out for yourself: Campbell Biology Ninth
Edition chapter 17 page 347
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are tina&erica Campbell& tisha Campbell sisters
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Erica Campbell's daughter is named Krista Campbell.