Concept 6 Genes are real things.

Excerpt of 1906 letter from W. Spillman to the American Breeders Association. The letter summarizes "recent" discoveries in genetics. Boxed text talks about the "theoretical" nature of genes.

Hugo de Vries, 1912.

A meeting between Hugo de Vries and Thomas Hunt Morgan.

Hugo de Vries.

Hugo de Vries and a group of scientists examining varieties of evening primrose.

Carl Correns.

"With best wishes, Carl Correns," around 1925.

Erich von Tschermak-Seysenegg, 1941.

Signed picture of Erich von Tschermak-Seysenegg, 1941.

Red blood cells are the oxygen/ carbon dioxide transporters of our body. They are unique in that early in their development they expel most of their cellular organelles including the nucleus. Red blood cells do not grow or divide and have a life span of about three months.

What are the advantages and disadvantages of being a single-celled organism? A multi-celled organism?

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Excerpt of 1906 letter from W. Spillman to the American Breeders Association. The letter summarizes "recent" discoveries in genetics. Boxed text talks about the "theoretical" nature of genes.