What is gene g responsible for in these fruit flies?

What does it mean for a cell membrane to be selectively permable

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

The picture showed normal blood cells which are around and sickle cells which appear much longer people with sickle-cell suffer from the sickle cell anemia which is inherited diseaseit is caused by a change in gene responsible for production of hemo goblin this type of change is known as an