What we call the evolutionary hypothesis is an explanation of a host of biological and paleontological observations—for instance, of certain similarities between various species and genera—by the assumption of common ancestry of related forms.
. . . I see in modern Darwinism the most successful explanation of the relevant facts. [Popper, 1957, p. 106]
There exists no law of evolution, only the historical fact that plants and animals change, or more precisely, that they have changed. [Popper, 1963b, p. 340]
I have always been extremely interested in the theory of evolution and very ready to accept evolution as a fact. [Popper, 1976, p. 167;]
The Mendelian underpinning of modern Darwinism has been well tested and so has the theory of evolution which says that all terrestrial life has evolved from a few primitive unicellular organisms, possibly even from one single organism. [Popper, 1978, p. 344;
''Furthermore, in his book, Objective Knowledge, where he uses the Darwinian paradigm as a basis for his own theory of knowledge, Popper not only discusses Darwinism at length as a scientific explanation but offers as an additional component a scientific hypothesis of his own—genetic dualism—which is intended to strengthen the orthodox neo-Darwinian framework (Popper, 1972, ''
