Q. How does a man show he's planning for the future?
A. He buys two cases of beer instead of one.
Wilhelm Ludvig JohannsenDied 11 Nov 1927 at age 70 (born 3 Feb 1857). Danish botanist and geneticist whose experiments in plant heredity offered strong support to the mutation theory of the Dutch botanist Hugo de Vries (that changes in heredity come about through sudden, discrete changes of the heredity units in germ cells). Many geneticists thought Johannsen's ideas dealt a severe blow to Charles Darwin's theory that new species were produced by the slow process of natural selection. In 1909, Johannsen proposed that each portion of a chromosome that controls a phenotype be called a "gene" (Greek: "to give birth to"). |
