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Evolution and the Catholic Church

Attitude of the Catholic Church to evolution theory

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Through Evolution, Christianity and Genetics

Early contributions to biology were made by Catholic scientists such as the Augustinian friar Gregor Mendel. Since the publication of Charles Darwin's On the Origin of Species in 1859, the attitude of the Catholic Church on the theory of evolution has slowly been refined. For nearly a century, the papacy offered no authoritative pronouncement on Darwin's theories. In the 1950 encyclical Humani generis, Pope Pius XII confirmed that there is no intrinsic conflict between Christianity and the theory of evolution, provided that Christians believe that God created all things and that the individual soul is a direct creation by God and not the product of purely material forces. Today, the Church supports theistic evolution, also known as evolutionary creation.

Catholic schools teach evolution as part of their science curriculum. They teach the fact that evolution occurs and that modern evolutionary synthesis is how evolution proceeds.

Early contributions to evolutionary theory

Catholics' contributions to the development of evolutionary theory included those of the Augustinian friar Gregor Mendel (1822-1884). Mendel entered the Brno Augustinian monastery in 1843, but also trained as a scientist at the Olmutz Philosophical Institute and at the University of Vienna. The Brno monastery was a centre of scholarship, with an extensive library and tradition of scientific research. At the monastery, Mendel discovered the basis of genetics following long study of the inherited characteristics of pea plants, although his paper Experiments on Plant Hybridization, published in 1866, remained largely overlooked until the start of the next century.

He developed mathematical formulae to explain the occurrence, and confirmed the results in other plants. Where Darwin's theories suggested a mechanism for improvement of species over generations, Mendel's observations provided explanation for how a new species itself could emerge. Though Darwin and Mendel never collaborated, they were aware of each other's work (Darwin read a paper by Wilhelm Olbers Focke which extensively referenced Mendel). Bill Bryson writes that "without realizing it, Darwin and Mendel laid the groundwork for all of life sciences in the twentieth century. Darwin saw that all living things are connected, that ultimately they trace their ancestry to a single, common source; Mendel's work provided the mechanism to explain how that could happen". Biologist J. B. S. Haldane and others brought together the principles of Mendelian inheritance with Darwinian principles of evolution to form the field of genetics known as the modern evolutionary synthesis.

Changing awareness of the age of the Earth and fossil records helped in the development of evolutionary theory. The work of the Danish scientist Nicolas Steno (1638-1686), who converted to Catholicism and became a bishop, helped establish the science of geology, leading to modern scientific measurements of the age of the Earth.

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