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In order for the evolutionist claim concerning "homology" to be taken seriously, similar (homologous) organs in different creatures should also be coded with similar (homologous) DNA codes. However, they are not. Similar organs are usually governed by very different genetic (DNA) codes. Furthermore, similar genetic codes in the DNA of different creatures are often associated with completely different organs.
Michael Denton, an Australian professor of biochemistry, describes in his book Evolution: A Theory in Crisis the genetic impasse of the evolutionist interpretation of homology:
"Homologous structures are often specified by non-homologous genetic systems and the concept of homology can seldom be extended back into embryology."160
A famous example on this subject is the "five digit skeletal structure" of quadrupeds which is quoted in almost all evolutionist textbooks. Quadrupeds, i.e., land-living vertebrates, have five digits on their fore- and hindlimbs. Although these do not always have the appearance of five digits as we know them, they are all counted as pentadactyl due to their bone structure. The fore- and hindlimbs of a frog, a lizard, a squirrel or a monkey all have this same structure. Even the bone structures of birds and bats conform to this basic structure.
Evolutionists claim that all living things descended from a common ancestor, and they have long cited pentadactyl limb as evidence of this. This claim was mentioned in almost all basic sources on biology throughout the 20th century as very strong evidence for evolution. Genetic findings in the 1980s refuted this evolutionist claim. It was realised that the pentadactyl limb patterns of different creatures are controlled by totally different genes. Evolutionist biologist William Fix describes the collapse of the evolutionist thesis regarding pentadactylism in this way:
The older text-books on evolution make much of the idea of homology, pointing out the obvious resemblances between the skeletons of the limbs of different animals. Thus the "pentadactyl" limb pattern is found in the arm of a man, the wing of a bird, and the flipper of a whale, and this is held to indicate their common origin. Now if these various structures were transmitted by the same gene couples, varied from time to time by mutations and acted upon by environmental selection, the theory would make good sense. Unfortunately this is not the case. Homologous organs are now known to be produced by totally different gene complexes in the different species. The concept of homology in terms of similar genes handed on from a common ancestor has broken down...161
Another point is that in order for the evolutionary thesis regarding homology to be taken seriously, the periods of similar structures' embryological development-in other words, the stages of development in the egg or the mother's womb-would need to be parallel, whereas, in reality, these embryological periods for similar structures are quite different from each other in every living creature.
To conclude, we can say that genetic and embryological research has proven that the concept of homology defined by Darwin as "evidence of the evolution of living things from a common ancestor" can by no means be regarded as any evidence at all. In this respect, science can be said to have proven the Darwinist thesis false time and time again.