Directional selection tends to favor phenotypes

How does the study of genetic disorders such as pku biologists understand normal alleles?

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

Anurse is in the dining room and overhears a new nurse tell a client with body dysmorphic disorder that she's much too thin and must eat more before she can go home. the client bursts into tears and runs out of the dining room. what is the best way for the nurse to address this situation?