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.
Mangoes flower in spring, and the fruit matures from October through to April, depending on the variety and the location. The fruit is ready to pick when the skin turns from green to yellow, orange or red (depending on the variety). Itâs also a good idea to pick a sample mango and cut it open. If the flesh next to the seed is yellow, the crop should be ripe in one week and can then be harvested.