IN CONTEXT

KEY ECOLOGIST

Gregor Mendel (1822–84)

BEFORE

1802 French biologist Jean-Baptiste Lamarck suggests that traits acquired during the lifetime of an organism are transmitted to its offspring.

1859 Charles Darwin proposes his theory of evolution and natural selection in his book On the Origin of Species by Means of Natural Selection.

AFTER

1869 Swiss chemist Friedrich Miescher identifies DNA, which he terms “nuclein.”

1953 Molecular biologists—including Briton Francis Crick and American James Watson—discover the structure of DNA.

2000s Researchers in the field of epigenetics describe inheritance by mechanisms other than through the DNA ...

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