From Brian J. Dooley:

Re: Genes affecting generosity may be found (Oct. 31): Attitudes toward generosity being very closely tied to culture (ranging from giving away everything always to giving away nothing if possible), I would be very much concerned about the possibility of selecting for a particular culture or ethnicity rather than for this particular trait. It does not seem likely that there is a 1:1 relationship between specific genes and culturally influenced characteristics of this type.