How are the castes distinguished in Brave New World?

Answer 1

The five castes, Alpha, Beta, Gamma, Delta, and Epsilon, distinguish each other based on several factors.

First and foremost, each caste wears a different color. Alphas wear gray, Betas wear mulberry, Gammas wear green, Deltas wear khaki, and Epsilons wear black.

Also, lower castes are given less oxygen as developing infants, making members of lower castes shorter, and in the case of the Deltas and Epsilons, more physically misshapen and stupid. It is because of these mental shortcomings that lower castes do factory work and upper castes hold jobs such as Directors, Psychiatrists, and Songsters.