“Consider your arms and legs. They contain exactly the same kinds of muscle cells, nerve cells, and so on. They contain the same proteins and other chemicals; the bones are made of identical substance. Yet they have different shapes, just as houses of different design can be made from the same building materials. The chemicals alone do not determine the form. Nor does the DNA. The DNA is the same in all the cells of the arms and the legs, and indeed everywhere else in the body. All the cells are genetically programmed identically. Yet somehow they behave differently and form tissues and organs of different structures. Clearly some formative influence other than DNA must be shaping the developing arms and legs. All developmental biologists acknowledge this fact. But at this stage their mechanistic explanations peter out into vague statements about “complex spatio-temporal patterns of physico-chemical interaction not yet fully understood.” Obviously this is not a solution but just another way of stating the problem.”
― Rupert Sheldrake, The Rebirth of Nature: The Greening of Science and God
“We are survival machines – robot vehicles blindly programmed to preserve the selfish molecules known as genes. This is a truth which still fills me with astonishment.”
― Richard Dawkins, The Selfish Gene