In the absence of lactose, the repressor protein encoded by the I gene binds to the lac operator and prevents transcription. Binding of allolactose to the repressor causes it to leave the operator. This enables RNA polymerase to transcribe the three genes of the operon.
A tough-skinned tropical fruit, the mango features a sweet, orange- to red-color flesh inside when ripe. Kensington pride, Kent, Palmer and sensation are only a few of the many varieties of mango available through groceries and markets.
Kensington Pride or 'Bowen' mangoes have the unfortunate attribute of producing a lot of sap at harvest. This sap can be extremely damaging to the skin of the mango, and in severe cases, can make the fruit totally unsaleable. In less severe cases, the fruit is left with an unsightly blemish (usually near the stem end) which is commonly mistaken by consumers as a fruit rot.