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History of Genetics Timeline

(1865 - Present)

The history of genetics traces humanity's understanding of heredity, beginning with Gregor Mendel's foundational experiments on pea plants in the 1860s, through the discovery of DNA's structure by Watson and Crick in 1953, to the completion of the Human Genome Project in 2003 and the rise of revolutionary gene-editing technologies like CRISPR. Less

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Early Modern Heredity

Epigenesis dominates views of embryonic development

100 BCE - 1650

Epigenesis had been the dominant opinion since antiquity and into the 17th century, holding that organisms develop from undifferentiated material.

Preformationism replaces epigenesis

1650 - 1800

Preformationism reappeared in modern times in the 17th century and then prevailed until the 19th century, replacing epigenesis as the dominant view of development.

Image source: Preformationism

Preformationism replaces epigenesis

New ideas about heredity emerge with taxonomy

1700 - 1800

In the 18th century, with increased knowledge of plant and animal diversity and the accompanying increased focus on taxonomy, new ideas about heredity began to appear.

Image source: History of genetics

New ideas about heredity emerge with taxonomy

Sageret establishes the concept of dominance

1826

In the early 19th century, Augustin Sageret established the concept of dominance, recognising that when some plant varieties are crossed, certain characteristics present in one parent usually appear in the offspring; he also found that some ancestral characteristics found in neither parent may appear in offspring.

Epigenesis re-established as the valid view of development

1859

Since the 19th century epigenesis was again able to establish itself as a view valid to this day, displacing preformationist ideas about development.

Ancient and Classical Ideas

Al-Zahrawi describes hereditary nature of haemophilia

1000

The Arab physician Abu al-Qasim al-Zahrawi (known as Albucasis in the West) was the first physician to describe clearly the hereditary nature of haemophilia in his Al-Tasrif.

Image source: Al-Zahrawi

Al-Zahrawi describes hereditary nature of haemophilia

Judah HaLevi describes dominant and recessive traits

1140

Judah HaLevi described dominant and recessive genetic traits in The Kuzari.

Image source: Judah Halevi

Judah HaLevi describes dominant and recessive traits

Mendelian Genetics

Gregor Mendel conducts pea plant breeding experiments

1856 - 1865

Between 1856 and 1865, Gregor Mendel conducted breeding experiments using the pea plant Pisum sativum and traced the inheritance patterns of certain traits.

Mendel lectures on his hybridisation experiments

Feb 1865 - Mar 1865

Gregor Mendel gave two lectures on his work in early 1865, presenting his findings on inheritance patterns in pea plants before publishing them formally.

Image source: Gregor Mendel

Mendel lectures on his hybridisation experiments

Publication of 'Experiments on Plant Hybridisation'

1866

Mendel's work was published in 1866 as 'Versuche über Pflanzen-Hybriden' (Experiments on Plant Hybridisation) in the Verhandlungen des Naturforschenden Vereins zu Brünn (Proceedings of the Natural History Society of Brünn), following two lectures he gave on the work in early 1865.

Image source: Experiments on Plant Hybridization

Publication of 'Experiments on Plant Hybridisation'

Mendel shows genes remain discrete through generations

1866

Mendel's results contradicted 19th-century theories of blending inheritance, showing that genes remain discrete through multiple generations of hybridisation. As he wrote: 'We must, therefore, regard it as certain that exactly similar factors must be at work also in the production of the constant forms in the hybrid plants.'

Image source: Mendelian inheritance

Mendel shows genes remain discrete through generations

Weismann's mouse tail experiments refute Lamarckism

1883

In 1883 August Weismann conducted experiments involving breeding mice whose tails had been surgically removed, providing evidence against the inheritance of acquired characters.

Image source: August Weismann

Weismann's mouse tail experiments refute Lamarckism

Hugo de Vries begins plant breeding experiments

1890 - 1899

In the 1890s Hugo de Vries was conducting breeding experiments with a variety of plant species, work that would lead him toward the laws of inheritance independently of Mendel.

Image source: Hugo de Vries

Hugo de Vries begins plant breeding experiments

De Vries publishes paper on discrete particles of inheritance

1897

In 1897 de Vries published a paper on his results that stated that each inherited trait was governed by two discrete particles of information, one from each parent, and that these particles were passed along intact to the next generation.

Mendelian principles studied across many organisms

1900 - 1915

By 1915 the basic principles of Mendelian genetics had been studied in a wide variety of organisms – most notably the fruit fly Drosophila melanogaster.

Image source: Drosophila melanogaster

Mendelian principles studied across many organisms

Rediscovery of Mendel's work launches modern genetics

1900

The 1900 rediscovery of Mendel's work by Hugo de Vries, Carl Correns and Erich von Tschermak led to rapid advances in genetics and established the theory of Mendelian inheritance.

Image source: Gregor Mendel

Rediscovery of Mendel's work launches modern genetics

De Vries publishes without crediting Mendel

1900

De Vries went ahead and published his 1900 paper without mentioning Mendel's priority, though later versions of his paper did acknowledge Mendel's earlier work.

De Vries is shown Mendel's 1866 paper

1900

In 1900 de Vries was preparing another paper on his further results when he was shown a copy of Mendel's 1866 paper by a friend who thought it might be relevant to his work.

Thomas Hunt Morgan shows genes reside on chromosomes

1910

In 1910, Thomas Hunt Morgan showed that genes reside on specific chromosomes, using his work with fruit flies to link Mendelian factors to physical structures within cells.

Image source: Thomas Hunt Morgan

Thomas Hunt Morgan shows genes reside on chromosomes

Mendelian model widely accepted

1925

Led by Thomas Hunt Morgan and his fellow 'drosophilists', geneticists developed the Mendelian model, which was widely accepted by 1925.

Image source: Modern synthesis (20th century)

Mendelian model widely accepted

Molecular Genetics

Frederick Griffith demonstrates bacterial transformation

1928

In 1928, Frederick Griffith showed that genes could be transferred between bacteria, a phenomenon known as transformation, hinting at the chemical nature of the genetic material.

Image source: Griffith's experiment

Frederick Griffith demonstrates bacterial transformation

Beadle and Tatum link genes to metabolic pathways

1941

In 1941, George Wells Beadle and Edward Lawrie Tatum showed that mutations in genes caused errors in specific steps of metabolic pathways, giving rise to the 'one gene, one enzyme' hypothesis.

Image source: George Beadle

Beadle and Tatum link genes to metabolic pathways

Avery, MacLeod and McCarty identify DNA as genetic material

1944

Oswald Avery, Colin Munro MacLeod, and Maclyn McCarty showed in 1944 that DNA holds the gene's information, establishing DNA as the molecule of heredity.

Image source: Avery–MacLeod–McCarty experiment

Avery, MacLeod and McCarty identify DNA as genetic material

Salvador Luria discovers reactivation of irradiated phage

1947

In 1947, Salvador Luria discovered the reactivation of irradiated phage, leading to many further studies on the fundamental processes of repair of DNA damage.

Image source: Salvador Luria

Salvador Luria discovers reactivation of irradiated phage

Franklin and Gosling produce clear X-ray diffraction pattern of DNA

1952

In 1952, Rosalind Franklin and Raymond Gosling produced a strikingly clear x-ray diffraction pattern indicating a helical form for DNA, crucial evidence for determining its structure.

Image source: Photo 51

Franklin and Gosling produce clear X-ray diffraction pattern of DNA

Watson and Crick demonstrate the double helix structure of DNA

1953

Watson and Francis Crick demonstrated the molecular structure of DNA in 1953. The discovery of the double helical structure marked the transition to the era of molecular genetics, alongside a new focus on model organisms such as viruses and bacteria.

Image source: Nucleic acid

Watson and Crick demonstrate the double helix structure of DNA

Meselson and Stahl demonstrate semiconservative DNA replication

1958

In 1958, Meselson and Stahl demonstrated that DNA replicates semiconservatively, leading to the understanding that each of the individual strands in double-stranded DNA serves as a template for new strand synthesis.

Image source: Meselson–Stahl experiment

Meselson and Stahl demonstrate semiconservative DNA replication

Jacob and collaborators discover the operon

1960

In 1960, Jacob and collaborators discovered the operon which consists of a sequence of genes whose expression is coordinated by operator DNA.

The nature of the genetic code is determined

1961 - 1967

In the period 1961–1967, through work in several different labs, the nature of the genetic code was determined, revealing how sequences of nucleotides specify amino acids in proteins.

Image source: Genetic code

The nature of the genetic code is determined

Genomics Era

First gene sequence determined by Walter Fiers' team

1972

In 1972, Walter Fiers and his team at the University of Ghent were the first to determine the sequence of a gene: the gene for bacteriophage MS2 coat protein.

Roberts and Sharp discover split genes

1977

Richard Roberts and Phillip Sharp discovered in 1977 that genes can be split into segments, revealing that eukaryotic genes contain introns interrupted by exons.

Image source: Intron

Roberts and Sharp discover split genes

Walter Gilbert hypothesises the RNA world

1986

It was first hypothesised in 1986 by Walter Gilbert that neither DNA nor protein would be required in such a primitive system as that of a very early stage of the earth if RNA could serve both as a catalyst and as genetic information storage processor.

Biologists pursue large-scale genome sequencing projects

1990 - 2000

In the last decades of the 20th century, many biologists focused on large-scale genetics projects, such as sequencing entire genomes, ushering in the era of genomics.

Image source: Human Genome Project

Biologists pursue large-scale genome sequencing projects

Key Facts

  1. Gregor Mendel, often called the 'Father of Genetics,' discovered the basic laws of inheritance through his experiments with pea plants published in 1866.
  2. In 1953, James Watson and Francis Crick, building on Rosalind Franklin's X-ray crystallography work, discovered the double-helix structure of DNA.
  3. The term 'genetics' was coined by William Bateson in 1905, shortly after Mendel's work was rediscovered in 1900.
  4. The Human Genome Project, launched in 1990 and completed in 2003, successfully mapped all approximately 20,000-25,000 human genes.
  5. CRISPR-Cas9 gene editing technology, developed in 2012, allows scientists to precisely modify DNA and won the 2020 Nobel Prize in Chemistry for Jennifer Doudna and Emmanuelle Charpentier.

Source

This History of Genetics timeline was generated with the help of AI, using information found on the internet.

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