In a vertebrate chimera, are particular organs homogenous genetically?
Chimerism (or genetic mosaicism if the cells come from the same zygote) is possible in the same organ or tissue. I don't think you will see a homogeneous distribution of the chimeric tissue because the tissue in any vertebrate organ is rarely homogeneous to begin with. Microchimerism may occur in a small number of cells. That's about all I know.