Figure 2.

Pedigree of laboratory colonies. (A) The branch of the pedigree showing the two genetic relationship among the two most dominant germ-cell competitors. (B) Another branch of the pedigree showing the genetic relationship among five other good germ-cell competitors. (C) A third branch of the pedigree showing the genetic relationship among the 4 poorest germ cell competitors. All of the colonies within the three branches, with perhaps the exception of colony A, have at least one parent who was a descendant from an initial pair of colonies that founded our laboratory stocks. Within this larger pedigree, the three branches are all distantly related to each other. Letters indicate colony identity. Listed below the identifier is the actual name of the colony in the pedigree (available on request).