I would like to comment a bit further on the subject of the development pattern of an egg that has had the genes replaced by those of a different species. From your comments, I gather that the morphology of this egg development is not monitored by genes. Have I understood it correctly?
I have been intrigued by the organization of unicellular beings, like some algae, into colonies, that develop specialization, and therefore seem to be a precursor of pluricellular beings. Now, I compare both phenomena, and ask. Could this association and specialization have also nothing to do with genes? What is your opinion?
Maybe I miss some important point, but, if original genes are removed and replaced by those of another species, and development follows the pattern of original species, how can genes have directed this?