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Introduction of one of the most important words for genetics: gen
Johannsen introduces the word “gene” as a new concept in genetics.
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Genes are in the chromosomes
Thomas Hunt Morgan demonstrates that genes reside in chromosomes. In addition, thanks to the phenomenon of genetic recombination, the position of various genes in chromosomes is described.
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The science above genetics
Conrad Waddington defined the epigenetic science which is the study of the heretable changes in the genetic expression by the environment.
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Genetic information is in the DNA
The Hershey and Chase experiment shows that genetic information from all organisms resides in DNA.
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Discovering the structure of DNA thanks to X-rays
Rosalind Franklin discovers the double helix DNA structure thanks to the X- ray, by using the photo 21.
James Watson and Francis Crick surprise the world with one of the most transcendental discoveries in the history of genetics.
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DNA replication
The Meselson-Stahl experiment shows that DNA is replicated in a semiconservative way.
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Genetic disorder caused by copying one more chromosome: Down syndrome
Lejeune discovers the cause of the Down syndrome, the copy of the 21st chromosome.
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Sheep Dolly was born
The first clonated animal was born, by using somatic cell nuclear transference.
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The sequency of the 23 pairs of chromosomes is complete
The human genome is finally completed, all the humans genes are sequenced.
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