TIMELINE ILUSTRACIÓN CORP

Contributors to the modern theory of evolution

1932JOHN HALDANE

1922RONALD FISHER

1866GREGOR MENDEL

1942ERNST MAYR

CHARLES DARWIN

Ronald Aylmer Fisher was a statistician and biologist who used mathematics to combine Mendel's laws with natural selection, thereby helping to create a new synthesis of Darwinism known as the modern evolutionary synthesis, and also a prominent eugenicist in the early in his life.

Haldane's work became one of the main contributions to synthetic evolutionary theory or modern synthesis, which reestablished natural selection as the essential mechanism of evolutionary change, explaining it in terms of the mathematical consequences of Mendelian genetics.

Gregor Mendel was the first to conclude that the characters of the parents are inherited by the descendants according to understandable laws. He discovered these laws and in 1866 published his results.

Mayr developed these principles in his 1942 book Systematics and the Origin of Species, one of the pillars of the so-called synthetic theory, which by combining Darwinism with genetics - a science that Charles Darwin could not get to know - became in the standard framework of evolutionary biology.

Darwin defined evolution as "descent with modification," the idea that species change over time, give rise to new species, and share a common ancestor. The mechanism that Darwin proposed for evolution is natural selection.

To be continued

ALFRED RUSSEL WALACE

THOMAS HUNT MORGAN

1927SEWALL WRIGHT

1937THEODOSIUS DOBZHANSKY

1945-1949GEORGE G. SIMPSON

Alfred Russel Walace proposes that all currently present species have originated from another now extinct species, that is, these species are the descendants of primordial ancestors, in most cases, simpler and more extinct.

Thanks to Sewall Wright and other authors such as John Burdon Sanderson Haldane or Sir Ronald Aylmer Fisher, population genetics experienced a very important advance. In fact, Wright is considered the father of the neo-Darwinian synthesis, also called the modern synthesis of evolution.

Thomas Hunt Morgan, who studied fruit flies, provided the first confirmation of the chromosome theory. Morgan discovered a mutation that affected the color of the fly's eyes. He observed that the mutation was inherited differently by male and female flies.

A specialist in Mesozoic and Cenozoic mammals, Simpson is, along with Theodosius Dobzhansky and Ernst Mayr, one of the main theorists of synthetic evolutionary theory. Tempo and Mode in Evolution and The Meaning of Evolution are his most representative works.

Dobzhansky proposed the idea that mutations can give rise to new species. He argued that mutations can occur spontaneously and that most of them have no particular effect. Only a minority produces a negative effect. These neutral changes create variation in the populations of a species.

EQUIPO 1

1972NILES ELDREDGEG

Eldredge developed a hierarchical view of evolutionary and ecological systems and was especially interested in the rapid extinctions of many habitats and species.