Concept 33 Genes can be turned on and off.
François Jacob at a Cold Spring Harbor meeting, 1953.
François Jacob, 1985.
Barbara McClintock (L) and Jacques Monod (R) at a Cold Spring Harbor meeting, 1946.
(L-R) Jacques Monod, Peter Lengyel, Walter Gibert, Luigi Gorini at a Cold Spring Harbor Meeting, 1966.
Jacques Monod and Suzanne Bourgeois, 1969.
Monod originally thought that β-gal was produced when lactose caused several pre-existing subunits to aggregate into the enzyme.
Before Jacob and Monod's lac operon model, what did scientists think about gene regulation?
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François Jacob at a Cold Spring Harbor meeting, 1953.
DNA is packaged in a chromosome.
Higher cells incorporate an ancient chromosome.
Some DNA does not encode protein.
Some DNA can jump.
Genes can be turned on and off.
Genes can be moved between species.
DNA responds to signals from outside the cell.
Different genes are active in different kinds of cells.
Master genes control basic body plans.
Development balances cell growth and death.
A genome is an entire set of genes.
Living things share common genes.
DNA is only the beginning for understanding the human genome.