Gregor Mendel ; Pre-Mendelian genetics ; Pangenesis ; Artificial selection and the evolutionists ; Mendel's contribution ; Johannsen and variation -- Darwin and the physicists. Kelvin and residual ...

Humans are now known to have between 20,000 and 25,000 genes, but researchers still have much to learn about these small segments of DNA.

<p>Letters sent from Charles Darwin to his cousin Francis Galton. Dates from the time of the publication of Galton's Narrative of an Explorer in Tropical South Africa in 1853 up until Darwin's death ...