Genetic Timeline

Main

Mendel

1843

Mendel's knowledge of statistics later proved valuable in his research on heredity. Also studied the heredity on pea plants.

Morgan

1900

Experimenting with the small fruit fly Drosophila melanogaster, observed that the flies have four pairs of chromosomes. Morgan also observed that three of the pairs were identicalin both females and males, but one pair differed in size and shape.

Griffith

1928

Was trying to develop a vaccine against a bacterium called Streptococcus pneumoniae.

Avery

1940

Set out to test whether the transforming agent in Griffith's experiment was protein, RNA or DNA. Avery and his colleagues did some test and concluded that DNA is responsible for transformation in bacteria.

Franklin

1950

Produced the X-ray diffraction photographs of DNA crystals.

Hershey-Chase

1952

They went out to test whether DNA or protein was the hereditary material viruses transfer when viruses enter a bacterium. Hershey and Chase did a lot of test and concluded that DNA is the hereditary molecule in viruses.

Watson-Crick

1953

Teamed up to try to determine the structure of DNA. They had put together a model for the structure of DNA. Watson and Crick proposed that DNA is a made of two chains that wrap around each other in the shape of double helix, a shape similar to a winding spiral staircase. Their final model was correct and was remarkable because it explained how DNA could replicate. They also relied on other scientists' work to develop their DNA model.

Human Genome Project

1990

Is a research effort undertaken to sequence all of our DNA and locate within it all of the functionally important sequences, such as genes.